Sometimes fear can bring about good changes. Such as, my desire to begin losing weight in February. It was because I do not want to become a diabetic. That fear brought change, which was a good type of change.
And also, we are taught to fear God.
Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters. Revelation 14:7
Work out your own salvation with fear and trembling. Philip. 2:12
Faith cometh by hearing the word of God. Rom. 10:17
Christ works mighty miracles among the children of men according to their faith. 2 Ne. 26:13