Impetuses for Krsna's Service
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In the Tenth Canto of  Śrīmad-Bhāgavatam , 38th Chapter, 5th verse, Akrūra says: “Because I am going to see Lord Kṛṣṇa today, all symptoms of inauspiciousness have already been killed. My life is now successful because I shall be able to offer my respects unto the lotus feet of the Supreme Personality of Godhead!”
Another devotee in ecstatic reverential affection once said, “When will that glorious day in my life come when it will be possible for me to go to the bank of the Yamunā and see Lord Śrī Kṛṣṇa playing there as cowherd boy?”
When there is no diminishing of this ecstatic love and when it is freed from all kinds of doubt, that stage is called steady love for Kṛṣṇa. In this stage all expressions of unhappiness by the devotee are called  anubhāva , or ecstatic loving symptoms.
The symptom of ecstatic affection with reverence felt by Bali Mahārāj is expressed as follows: “My dear Lord, You have simultaneously punished me and showed me Your causeless mercy. My conclusion is that when I have taken shelter of Your lotus feet I shall never be disturbed in any condition of life. Whether You give me the opportunity to enjoy all the yogic perfections, or You put me into the most abominable condition of hellish life, I shall never be disturbed.”
Kṛṣṇa, Himself, after seeing Bali Mahārāj, told Uddhava, “My dear friend, how can I express the glorious characteristics of Bali Mahārāj, the son of Virocana? Although the king of the  suras  [demigods] was cursed by this son of Virocana, and although I cheated him in my incarnation as Vāmana, taking away his dominions throughout the universe, and although I still criticized him for not fulfilling his promise, I have just now seen him in his kingdom, and he feelingly expressed his  love  for me.”*
When such a feeling of love becomes intensified, it is called affect.
* Bali was a king of the demons who waged war against the demigods and nearly conquered the universe. When the demigods prayed for help, the Lord appeared as Vāmanadeva, a dwarf  brāhmaṇa , and asked Bali for three paces of land. Bali agreed, and Vāmana covered all the worlds with His first two steps. Then He demanded to know where His third pace was to be. Bali offered his own head beneath the Lord's foot and thus became a  mahājana , or great devotee.