An important Old Testament truth is “The fear of the Lord is the beginning of wisdom” (Psalm 111:10; cf. Proverbs 1:7, 9:10). [For the Christian] it’s not the fear of being doomed to eternal torment, nor a hopeless dread of judgment that leads to despair. Instead, it’s a reverential fear, a holy concern to give God the honor He deserves and avoid the chastening of His displeasure. It protects against temptation and sin and gives motivation for obedient, righteous living.
John MacArthur