Śrī Rādhā is the ocean of deep compassion, always showering Her devotees with the nectar-stream of Her mercy.
Those who have been touched by the nectar of that compassion, can testify.

Śrīla Raghunātha Dāsa Gosvāmī says:
karuṇā vidravad dehā – “Her body melts with compassion”.

Normally, a person’s heart melts with compassion, but only in Rādhārāṇī’s case the whole body melts with compassion. She always bathes in streams of ambrosial compassion, and because Kṛṣṇa accepted Her mood when He became Śrī Caitanya Mahāprabhu, Mahāprabhu is so merciful!

Mahāprabhu does not consider who is qualified or unqualified, who is from which caste or from which āśrama. He gives prema (love of God) without making such distinctions! That is ‘a body melting with compassion’!

It is Rādhā’s storehouse of compassion, not Kṛṣṇa’s!

In Vraja-līlā the storehouse of Rādhā’s mercy remained hidden and closed, but when Mahāprabhu accepted the mood and complexion of Śrī Rādhā, it became manifest to the world!
Mahāprabhu showed the people of the world how the body can melt with compassion, because He assumed Śrī Rādhā’s merciful mood.
Because Rādhikā’s body melts with compassion, it can be compared to the fourth cosmic ocean, the ocean of clarified butter. (4)

tika to Sri Sri Radha Rasa Sudhanidhi, verse 18