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.
When Vṛṣāsura appeared in Vṛndāvana as a bull, all of the gopīs became greatly affected with fear. Being perturbed in that way, they began to embrace the tāmala trees. This is an instance of fearfulness caused by a ferocious animal and of the search for shelter while remembering Kṛṣṇa in ecstatic love. Upon hearing the jackals crying in the forest of Vṛndāvana, Mother Yaśodā sometimes became very careful about keeping Kṛṣṇa under her vigilance, fearing that Kṛṣṇa might be attacked by them. This is an instance of ecstatic love for Kṛṣṇa in fearfulness caused by a tumultuous sound. This kind of fearfulness is a little different from being actually afraid. When one is afraid of something, he can still think of past and future. But when there is this kind of ecstatic apprehension, there is no scope for such thinking.
Emotion is caused by something very dear, by something very detestable, by fire, strong wind, strong rainfall, by some natural disturbance, the sight of a big elephant, or the sight of an enemy. When there is emotion caused by seeing something very dear, one can speak very swiftly and use kind words. When there is emotion caused by seeing something detestable, one cries very loudly. When there is emotion caused by seeing fire, one tries to fly away. There may also be trembling of the body, closing of the eyes and tears in the eyes. When one becomes emotional on account of a strong wind, one tries to run very swiftly and rubs his eyes. When one is emotional because of rainfall, one takes an umbrella, and there is tension in his body. When there is emotion due to a sudden disturbance, one's face becomes discolored, one becomes struck with wonder, and there is trembling of the body. If there is emotion from seeing an elephant, one may jump, show various signs of fearfulness, and sometimes one may keep looking behind him. When there is emotion due to the presence of an enemy, one looks for a fatal weapon and tries to escape.