CC Madhya 23.45
śānta, dāsya, sakhya, vātsalya, madhura āra
“According to the candidate possessing these transcendental qualities [sneha, māna and so on], there are five transcendental mellows — neutrality, servitorship, friendship, parental love and conjugal love.
In the Bhakti-rasāmṛta-sindhu (184.108.40.206), rati (attraction) is thus described:
mumukṣu-prabhṛtīnāṁ ced bhaved eṣā ratir na hi
abhijñena subodho ’yaṁ raty-ābhāsaḥ prakīrtitaḥ
“The real symptoms of the fructification of the seed of love (rati) are manifested because the heart is melted. When such symptoms are found among speculators and fruitive actors, they cannot be accepted as real symptoms of attachment. … Foolish people without knowledge of devotional service praise such symptoms of attachment even when they are based on something other than a desire to serve Kṛṣṇa. However, one who is expert in devotional service calls such symptoms raty-ābhāsa, a mere glimpse of attachment.”