On Easter the women were fearful when the angels appeared. Because of his lost condition sinful man always fears in God's presence. But God takes no pleasure in the fear of man. It means that God forgives the sinner. God removes the fear of the sinner by forgiving his sin.
Forgiveness takes away man's guilt.
Then fear disappears. That's what Jesus did for the disciples. His faith causes this man to obey the Lord. I won't do it. Surely his command contains a promise.