After Lord Brahmā had stolen all of the calves, cows and cowherd boys from Kṛṣṇa, he was trying to go away. But all of a sudden he became doubtful about his stealing affairs and began to watch on all sides with his eight eyes. Lord Brahmā has four heads, and therefore he has eight eyes. This is an instance of ecstatic love in doubtfulness, caused by stealing.
Similarly, just to please Kṛṣṇa, Akrūra stole the Syamantaka-maṇi, a stone which can produce unlimited quantities of gold, but later on he repented his stealing. This is another instance of ecstatic love for Kṛṣṇa in doubt caused by stealing.
The King of heaven, Indra, was advised to surrender himself at the lotus feet of Kṛṣṇa when he was causing torrents of rain to fall on the land of Braja. At that time Indra's face became very darkened out of doubtfulness.
When a person becomes disturbed in his heart by seeing lightning in the sky, by seeing a ferocious animal, or by hearing a tumultuous sound, his state of mind is called apprehensive. In such a state of apprehension, one tries to take shelter of something which provides safety. There may be standing of the hairs on the body, trembling of the body and sometimes the committing of mistakes. And sometimes the body may become stunned.
In the Padyāvalī there is the following statement: "My dear friend, Kṛṣṇa's residence in the demonic circle at Mathurā, under the supremacy of the King of demons, Kaṁsa, is causing me much worry." This is one instance of apprehending some danger to Kṛṣṇa in ecstatic love for Him.