Fear is one of the most important primary emotions that work in its natural form to preserve life. Animals become afraid and terrified, then startle and flee to take refuge in a place that will protect them from the evil that is pursuing them. The child is afraid of sudden loud noises, and is afraid of falling to the ground from a high place, and screaming in emptiness or running away, like the rest of the animals.

When a person is afraid, he shouts, screams, and groans. He may spread his legs to the wind as he runs away, and he may be seized with intense trembling that shakes his soul violently. He speaks while he is afraid, and the words tremble on his lips, terror appears in his eyes, and the muscles in his face contract.