kvāpy ānuṣaṅgikatayodita rādhikākhyā
vismāritākhila vilāsa kalā kalāpam
kṛṣṇeti varṇa yugala śravaṇānubandha
prādurbhavaj jaḍima ḍambara saṁvītāṅgīm

O Kṛṣṇa! When You even casually hear Śrī Rādhikā’s name You promptly forget all Your other artful plays!
O Rādhe! Simply by hearing the two syllables Kṛ-ṣṇa Your body is pervaded by ecstatic symptoms like inertia!

ŚRĪ YUGALA NĀMA RASA  (The Flavor of the Dual Name):

Makaranda Kaṇā Vyākhyā:

Śrīpāda sits on the throne of relish and savors the sweetness of the Divine Pair. In this verse he perceives the sweetness of the holy name. He tastes the remnants of Rādhā-Śyāma’s relish of Each others’ sweet names.
The names of the Lord and His internal potency (like Rādhā) are not like the names of worldly people:

deha dehī nāma nāmī kṛṣṇe nāhi bheda;
jīvera dharma nāma deha svarūpa vibheda
(Caitanya Caritāmṛta)

    “There’s no difference between the name Kṛṣṇa and the person Kṛṣṇa, but there is a clear difference between the individual souls and their names.”

Just as there is no difference between the soul and the body of the Lord, there is also no difference between He and His name. The Kūrma Purāṇa confirms this:
deha dehībhidāś cātra neśvare vidyate kvacit.

But for the conditioned souls there is difference between the soul and the body, between the body and its designation. Only in manifestation there is difference between Śrī Kṛṣṇa and His holy name. In truth they are non-different.
All transcendental potencies are fully present in the holy name of Kṛṣṇa:

nāmaś cintāmaṇi Kṛṣṇaś caitanya rasa vigrahaḥ
pūrṇa śuddho nitya mukto’bhinnatvān nāma nāmino
(Padma Purāṇa)

    “The holy name of Kṛṣṇa is like a Cintāmani-stone (that sanctifies everything it touches), it is the very form of consciousness and spiritual flavor, it is completely pure, eternally liberated and it is non-different from Kṛṣṇa Himself.”

Therefore the sweetness of the holy name of Kṛṣṇa, who is the embodiment of sweetness Himself, is also unlimited.

madhura madhuram etan maṅgalaṁ  maṅgalānāṁ
sakala nigama vallī sat phalaṁ cit svarūpam
sakṛd api parigītaṁ śraddhayā helayā vā
bhṛgu-vara nara-mātraṁ tārayet Kṛṣṇa nāmaḥ
(Skanda  Purāṇa, Prabhāsa Khaṇḍa)

    “O Bhṛguvara (Śaunaka Ṛṣi)! Kṛṣṇa’s constitutionally transcendental name is the fruit of the  vines of all the Vedas, sweeter than sweet and more auspicious than all that is auspicious. It is completely transcendental and it redeems any human being whenever he chants it, either with faith or casually!”

In this way, we can find many glorifications in the scriptures and from the mouths of the great saints of the holy name of Śrī Kṛṣṇa being as powerful, glorious and sweet as Śrī Kṛṣṇa Himself.

This verse describes how Śrī-Śrī Rādhā-Mādhava are attracted to Each others names.

“O Kṛṣṇa! When You even casually hear Rādhā’s name You forget all Your playful arts!”

In pūrva rāga (beginnings  of love), one sakhī tells Śrī Rādhikā how ecstatic Śrī Kṛṣṇa is about Her holy name:

campaka dāma heri,           cita ati kampita,
locana bohe anurāga
tuya rūpa antare,             jāgaye nirantara,
dhani dhani tohāra sohāga

    “O Rādhe! When Subala gives Kṛṣṇa a golden garland of Campaka-flowers, His mind trembles and tears of passionate love flow from  His eyes.
O beautiful girl! Your form always awakens great love  in His heart!”

vṛṣabhānu nandini,            japaye rāti dini
bharama na bolaye ān.
lakho lakho dhani,                bolaye madhura vāṇī,
svapane na pātaye kān.

    “Day and night He murmurs: ‘Vṛṣabhānu Nandini!’, without saying anything else.
Although hundreds of thousands of girls speak  sweet words to Him, He does not listen to them even in dreams!”

‘rā’ kohi ‘dhā’ pahuṁ,              kohoi na pāroi,
dhārā dhari bohe lora
soi purukh maṇi,             loṭāya dharani puni,
ko koho ārati ora

    “He can only pronounce the first syllable of Your name, Rā, but  out of ecstasy He can not pronounce the other one, ‘Dhā’. His  eyes carry streams of tears. That jewel of men thus rolls on the ground. Who can describe His distress?”

govinda dāsa tuyā,                 caraṇe nivedalo,
kānuka etohuṁ saṁvāda
nīcaye jānaho,          tachu dukha khaṇḍaka,
kevala tuyā parasāda.

    “Govinda Dāsa submits this news about Kānu (Kṛṣṇa) to Your  lotus-feet: Know that He feels miserable and that only Your grace can destroy His suffering!”   

In the morning, after bathing and dressing, Śyāmasundara sits in His bhajana kuṭīra to do japa of Rādhā-nāma. For the fulfillment of His desires He sits in the great tīrtha (holy water) of king Cupid in a nikuñja-temple on the bank of the Yamunā, meditating on the effulgence of Her lotus-feet and doing japa of Rādhā-nāma.

kālindī taṭa kuñja mandira gato yogīndravad yat pada
jyotir dhyāna paraḥ sadā japati yaṁ premāśru pūrṇo hariḥ
kenāpy adbhutam ullasad rati rasānandena sammohitaḥ
sā rādheti sadā hṛdi sphuratu me vidyā parā dvy akṣarā
(Rādhā Rasa Sudhānidhi – 96)

    “May the two supremely astonishing,  blissful, rasika, erotic and enchanting syllables ‘Rā-dhā’, which fulfill all desires, which are muttered by Śrī Hari Who sits in a bower house on the bank of  the Yamunā as the king of yogīs,  meditating on the effulgence of Her lotus-feet with eyes filled with tears of love, always be manifest in my heart!”

If Kṛṣṇa by chance hears the name ‘Rādhā’ from anyone’s mouth, He is astonished by rati rasānanda and says:

rādhā nāma kevā śunāile;  śuni mora prāṇa juḍāile
ei nāme āche ki mādhurī;  śravaṇe rahalo sudhā bhori
cite niti mūrati vikāśa;  amiyā sāgare yeno vāsa
dekhite nayane lāge sādha; e yadunandana mana kānda

” ‘My  dear sakhi!  Who chanted Rādhā’s name?  When I heard it My heart was soothed!  How many names are there not in Gokula?  None of them can agitate My heart like this one. How much sweetness is there in this name, which fills My ears with sweet nectar and causes Her form to crystallize in My heart!  It is as if I reside in an ocean of nectar!’
Yadunandana’s mind cries: When I see this My eyes are blessed!”

No other consort is that fortunate! This Lord is our object of worship; we see the Lord, the Supreme Brahman fully subdued by Śrī Rādhā and submissive to Her. This does not diminish His glories, no! It rather increases His glories! All glories to that Supreme Form of Godhead! Śrīmatī is Prema Laksmī Herself and Kṛṣṇa is totally controlled by Her love; this is His great quality!   

Śrī Rādhā’s body is similarly studded by ecstatic symptoms of sāttvika bhāva when She simply hears the name ‘Kṛṣṇa’. In pūrva rāga, when Her heart becomes agitated and Her body becomes stunned, She tells Her sakhī:

soi! kevā śunāilo śyāma nāma?
kānera bhitor diyā,           marame paśilo go,
ākula korilo mora prāṇa

    “O friend! Who sang the name of Śyāma? Through my ears it entered into My heart and agitated Me!”

nā jāni koteko madhu,         śyāma nāme āche go,
vadana chāḍite nāhi pāre
japite japite nāma,          avaśa korilo go,
kemone vā pāsaribo tāre

    “I don’t know how much honey there is in Śyāma’s name, and my mouth cannot give it up! When I repeat this name I become overwhelmed! How can I forget it?”

nāma paratāpe yāra,               aichana korilo go,
aṅgera paraśe kibā hoy
yekhāne vasati tāra,               nayāne dekhiyā go,
yuvatī dharama koiche roy

    “If His name has such power, then what will the touch of His body do? Wherever I stay My eyes see Him. How can I then uphold the principles of a young married girl?”

pāsarite kori mone,               pāsarā nā yāya go,
ki koribo ki hobe upāya
kohe dvija caṇḍī dāse,              kulavatī kula nāśe,
āpanāra yauvana yācāya.

    “I try to throw Him out of My mind, but I can’t. What shall I do now? Dvija Caṇḍī dāsa says: “The reputation of this married girl is destroyed.”

When mahābhāvamayī Rādhā simply hears Kṛṣṇa’s name, She is attacked by sāttvika ecstasies. Although She is deeper than millions of oceans, the sweetness of Kṛṣṇa’s name is churning Her heart.
Simply on hearing the syllables She becomes impatient.

dūrād apy anuṣaṅgataḥ śrutim iti tvan nāma dheyākṣare
sonmādaṁ madirekṣaṇā viruvatī dhatte muhur vepathum
āḥ kiṁ vā kathanīyam anyad asite daivān navāmbhodhare
dṛṣṭe taṁ parirabdhum utsukamatiḥ pakṣa-dvayīm icchati
(Vidagdha Mādhava)

    Viśākhā told Kṛṣṇa: “O Kṛṣṇa! When the syllables of Your name accidentally enter Her earholes, restless-eyed Rādhā becomes intoxicated and begins to tremble like mad. O! What more can I say? When by chance She sees a fresh monsooncloud She becomes so eager to embrace it that She desires a pair of wings!”

In this way they both become overwhelmed by ecstasy when They hear Each others names. The clever devotees also become blessed with Their grace in the form of devotional service to Their lotus-feet by chanting Their names,
knowing how attached They are to Each other’s names.

Śrīla Narottama dāsa Thākura sings:

Kṛṣṇa nāma gāne bhāi,             rādhikā caraṇe pāi,
rādhā nāma gāne Kṛṣṇa candra
saṅkṣepe kohinu kothā,              ghucāo moner byathā,
duḥkhamoy anya kathā dhanda
(Prema Bhakti Candrikā)

    “O brother! When you sing the name of Kṛṣṇa You get the lotus-feet of Rādhikā, and when you sing the name of Rādhā you get Kṛṣṇa-candra. I tell you in short, and it will soothe the pain of your mind.
All other topics simply make you miserable.”

ācambite rādhā nāma,          śunile śravaṇe śyāma,
ki ānanda ke bolite pāre.
akhila vilāsa kalā,           bhule yāya nandalālā,
tanu kāmpe pulakera bhare.

    “Who can describe Śyāma’s ecstasy when He accidentally hears Rādhā’s name? Nandalāla (Kṛṣṇa) then forgets all His playful arts and starts trembling all over His body.”

Kṛṣṇa ei duṭi varṇe,           praveśa korile karṇe,
rādhikāra antare ullāsa.
jāḍya bhāva kori koto,              sāttvika vikāra yoto,
aṅge aṅge hoy parakāśa.

    “When the two syllables ‘Kṛ-ṣṇa’ enter into Rādhikā’s ears they delight Her heart and then She becomes overwhelmed by sāttvika ecstasies like inertia on each and every limb.”  

rādhā nāme śyāma rāya,            yemati pāgala prāya,
Kṛṣṇa nāme rāi unmādinī
rādhā-Kṛṣṇa nāma-mālā,           bhakta kaṇṭhe kore ālā,
guṇa gāya śrī rūpa gosvāmī

    “Just as Śyāma Rāya goes mad from Rādhā’s name Rāī also goes mad from Kṛṣṇa’s name. The garland with Rādhā-Kṛṣṇa-nāma beautifies the necks of the devotees and Śrī Rūpa Gosvāmī sings Their glories.”