ādhāya mūrdhani yadā purudāra gopyāḥ
kāmyaṁ padaṁ priyaguṇair api picchamauleḥ
bhāvotsavena bhajatāṁ rasa kāmadhenuṁ
tāṁ rādhikā caraṇa reṇum ahaṁ smarāmi

I remember the foot-dust of Śrī Rādhikā, which is held on the heads by the very generous gopīs of Vraja who desire the position which, with all its beloved attributes, is even desired for by Kṛṣṇa, Who wears a crown of peacock-feathers.
This foot-dust is a wish-yielding Kāmadhenu-cow of rasa for all those who worship it with a festival of loving emotions.

THE KĀMADHENU-COW OF THE PERFECTION OF RASA :

Commentary: The gopīs are called purudāra, or most generous because their love for Kṛṣṇa is completely free from all desires for personal gratification. Such pure love is rare in this world. The gopīs have said goodbye to all mundane, traditional codes of morality and are exclusively engaged in pleasing Kṛṣṇa, at any cost.
Śrīpāda Śuka Muni described their most generous love for Kṛṣṇa in Śrīmad Bhāgavata (10.31.19):

yat te sujāta caraṇāmburuhaṁ staneṣu bhītaḥ śanaiḥ priya dadhīmahi karkaśeṣu
tenāṭavīm aṭasi tad vyathate na kiṁ svit kūrpādibhir bhramati dhīr bhavad āyuṣāṁ naḥ

After Kṛṣṇa had left them during the Rāsa-dance, the beautiful gopīs suffered separation from Him and prayed: “O Dearly beloved! Your feet are like beautiful tender, nicely grown lotus-flowers. We carefully place them on our hard breasts, afraid that they will be hurt. Can You then even imagine how worried we are when You roam over the forest-paths where there are so many sharp pebbles, thorns and bulbs? You are our very life and we feel very disturbed when we think of that!”

Usually a girl feels very happy for her own sake when she gets the feet of her man on her breasts, but the gopīs don’t just feel such happiness when Śrī Kṛṣṇa places His lotus-feet on their breasts; they are only concerned about His welfare. He is dearer to them than millions of lives, so they are simply afraid that He will hurt Himself while He places His tender lotus-feet on their breasts. Only the rasika devotees understand that there is absolutely no desire for personal happiness in the gopīs’ hearts. But, although the gopīs have no such desire, and actually because they have no personal desires, they are the most blissful. Thus prema remains established as the highest goal of human life, since everybody naturally looks for happiness. For the attainment of this goal one should follow in the footsteps of the gopīs and particularly of Śrī Rādhā.

Not only the gopīs desire the service of Śrī Rādhā’s lotus-feet, since She is the greatest of them all, but even Śrī Kṛṣṇa Himself desires this. Once, after enjoying loving pastimes with Him, Śrī Rādhikā proudly orders Him to redress Her before Her girlfriends will notice that They have made love, and will ridicule Her. Śrīpada, in his form as Rādhikā’s maidservant, brings all the items for Her dressing. Śrīmatī orders Kṛṣṇa: “Anoint My feet with foot lac!” Kṛṣṇa places Nagarī-maṇi’s (Rādhā, the jewel of ladyloves) feet on His chest and starts the job. The kiṅkarī brings Him a brush and a cup with the liquid lac. Nāgara holds the brush and the kiṅkarī holds the cup. Nāgara loses Himself when He beholds the sweetness and beauty of Rādhikā’s foot soles. Sometimes He holds them to His chest and sometimes He kisses them while tears of love flow from His eyes. Śrīmatī nervously says: “What are You doing? Put the lac on! Quickly!” Nāgara’s hands shiver of ecstasy, so Svāminī slightly smiles and tells Her kiṅkarī: “Nāgara cannot do it, you do it!”, so the kiṅkarī softly pushes Kṛṣṇa away, saying: “Śyāma, move up! You can’t do it!” Nāgara thinks: “Alas! When will I be so fortunate to serve Svāminī’s feet like this kiṅkarī? How can I become as qualified as her?” This shows how even Kṛṣṇa desires the foot service of Śrī Rādhā.

The Kāmadhenu (desire-cow) was churned out of the milk ocean by the demons and the gods and she fulfills all desires. In the same way the dust of Śrī Rādhikā’s lotus-feet gives Rādhikā’s maidservants the perfection of rasa. Within the mellow of service these kiṅkarīs also relish the mellow of friendship. The writers of the rasa-śāstras say that the parental mellow (vātsalya rasa) is incompatible with the sweet conjugal mellow (mādhurya rasa), but in Śrī Rādhikā’s storehouse of rasa there is no shortage of parental affection for Her maidservants. The foot-dust of Śrī Rādhikā is thus a wish-yielding Kāmadhenu-cow, that contains dāsya, sakhya, vātsalya and mādhurya rasa.
jaya jaya rādhāpada, reṇu-kaṇā ye sampad,
mahojjvala mahāratna khani
caraṇa parāga kaṇā, śire dhari vrajāṅganā,
manojña guṇete hoilā dhani

“All glories to the treasure of Rādhā’s foot-dust, which is a mine of great brilliant jewels! The gopīs have held specks of this dust on their heads to become blessed with its enchanting attributes.”

rūpe guṇe ḍagamagi, prema puṣṭa yoto gopī,
piñchamauli govinda vāñchita
rādhikā caraṇa reṇu, bhūṣaṇa koriyā tanu,
sevā sukha bhuñje avirata

“The gopīs’ love is nourished when they become immersed in the forms and qualities of this dust, which is also coveted by Govinda, the boy with a crown of peacock-feathers. Even He always enjoys Rādhikā’s service and decorates His body with Her foot-dust.”

nibhṛta nikuñja mājhe, bhāvotsave yārā bhaje,
yugalera caraṇa kamala
sei sob sevā prāṇa, dāsī-gaṇe sarvottamā,
rasa kāmadhenu niramala

“This dust is like a spotless Kāmadhenu-cow for Rādhikā’s best maidservants, for whom this service is their very life, and who worship the lotus-feet of Rādhā-Kṛṣṇa in a festival of loving emotions in a lonely bower.”

rādhikā caraṇa reṇu, koṭi cintāmaṇi janu,
mane mora smaraṇa vilāsa
śrīpada prabodhānanda, nigūḍha bhajanānanda,
svasaṅkalpa korilā prakāśa

“Śrī Rādhikā’s foot-dust is more valuable than millions of Cintāmaṇi-gems and my mind relishes its remembrance. Thus Śrī Prabodhānanda, who finds pleasure in this intimate worship, reveals His aspirations.”