In the Vidagdha-mādhava there is the following statement: "When Kṛṣṇa was playing on His flute, Baladeva very anxiously declared, 'Just see how, after hearing the transcendental sound of Kṛṣṇa's flute, Indra, the King of heaven, is crying in his heavenly kingdom! And from his teardrops falling on the ground, Vṛndāvana appears to have become a celestial residence for the demigods.' "
Ecstatic love for Kṛṣṇa, which is known as anubhāva, is symptomized by the following signs: one becomes engaged exclusively in the service of the Lord, being attentive to carry out the orders of the Lord faithfully; one becomes undisturbed and nonenvious in full transcendental loving service to the Lord; and one makes friendship with the devotees of the Lord who are situated in faithful service to Him. All of these symptoms are called anubhāva, ecstatic love.
The first symptom of anubhāva, or engagement in a particular type of service, is exemplified by Dāruka, a servant of Kṛṣṇa who used to fan Kṛṣṇa with a cāmara, a bunch of hair. When he was engaged in such service, he was filled with ecstatic love, and the symptoms of ecstatic love became manifest in his body. But Dāruka was so serious about his service that he checked all of these manifestations of ecstatic love and considered them hindrances to his engagement. He did not care very much for these manifestations, although they automatically developed.
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.