Śrīla Rūpa Gosvāmī says that although he has no expert knowledge about the sounds and meanings and mellows of the symptoms of ecstatic love, he has tried to give some examples of different varieties of love of Kṛṣṇa. He further states that the thirty-one disturbing symptoms of ecstatic love, plus nine other symptoms, all taken together equal forty primary symptoms of ecstatic love. These symptoms create transformations of bodily activities as well as movements of the senses. All of them can be accepted as different feelings of the heart. Sometimes some of the feelings are quite natural. Sometimes some of the feelings are just temporary appearances. Those symptoms which are very natural always remain, both within and without the devotee.
As one can detect the color of dye a cloth was soaked in by looking at the cloth, so, simply by understanding the different signs of these symptomatic features, one can understand the actual position. In other words, although attachment for Kṛṣṇa is one, nevertheless, because there exist different kinds of devotees, such attachment is manifested in many varieties. As clothing tinged red appears red, so the temporary appearance of a certain type of feeling can be detected or observed by the specific ecstatic symptom. In fact, all the different humors and mellows of the devotees possess various specific feelings within the mind. And, according to these differences, the symptoms of ecstatic love appear in different forms and degrees. If one's heart is highly elevated, grave and magnanimous, or if one's heart is rough and crude, different symptoms of ecstatic love will appear, influenced by the condition of the heart. Actually, people cannot generally understand such different qualities of mentality, but when one's heart is very soft or gentle, these symptoms become very easily visible, and one can understand very clearly. The heart of one who is highly elevated and grave is compared with gold. If one's heart is very soft and gentle, his heart is compared with a cotton swab. When there is an ecstatic sensation within the mind, the golden heart or grave heart is not agitated, but the soft heart immediately becomes agitated.
To offer another example, a grave, magnanimous heart is compared to a great city, and a soft heart to an insignificant cottage. There may be many lights, or even great elephants in the big city, but no one will take particular notice of them. But when such lights or elephants are seen near a small cottage, everyone can distinctly point them out.