In Śrīmad-Bhāgavatam, Tenth Canto, Eighty-sixth Chapter, verse 38, there is a statement of how Śrutadeva, a brāhmaṇa from the country called Mithilā in northern India, became so overpowered with joy as soon as he saw Kṛṣṇa that immediately after bowing to the Lord's lotus feet he stood up and began to dance, raising his two arms above his head.
One of the devotees of Lord Kṛṣṇa once addressed Him in this manner: "My dear Lord, although You are not a professional dancer, by Your dancing You have so astonished us that we can understand that You are personally the master of all dancing. Certainly You must have learned this dancing art directly from the goddess of love." When a devotee dances in ecstatic love, there are manifestations of symptoms which are called sāttvika. Sāttvika means that they are from the transcendental platform. They are not symptoms of material emotion; they come from the soul proper.
In Śrīmad-Bhāgavatam, Tenth Canto, Eighty-fifth Chapter, verse 38, Śukadeva Gosvāmī tells Mahārāja Parīkṣit that after surrendering everything unto the lotus feet of Vāmanadeva, Bali Mahārāja immediately caught hold of the lotus feet of the Lord and pressed them to his heart. Being overwhelmed with joy, he manifested all the symptoms of ecstatic love, with tears in his eyes and a faltering voice.
In such expressions of ecstatic love there are many other subsidiary symptoms, such as jubilation, withering, silence, disappointment, moroseness, reverence, thoughtfulness, remembrance, doubtfulness, confidence, eagerness, indifference, restlessness, impudence, shyness, inertness, illusion, madness, ghastliness, contemplation, dreaming, disease and signs of death. When a devotee meets Kṛṣṇa, there are symptoms of jubilation, pride and perseverance, and when he is feeling great separation from Kṛṣṇa, the symptoms of ghastliness, disease and signs of death become prominent.