Charles H. Spurgeon on Psalms 56:3

What time I am afraid. David was no braggart, he does not claim never to be afraid, and he was no brutish Stoic free from fear because of the lack of tenderness. David's intelligence deprived him of the stupid heedlessness of ignorance, he saw the imminence of his peril, and was afraid. We are men, and therefore liable to overthrow; we are feeble, and therefore unable to prevent it; we are sinful men, and therefore deserving it, and for all these reasons we are afraid. But the condition of the psalmist's mind was complex —he feared, but that fear did not fill the whole area of his mind, for he adds, I will trust in thee. It is possible, then, for fear and faith to occupy the mind at the same moment. We are strange beings, and our experience in the divine life is stranger still. We are often in a twilight, where light and darkness are both present, and it is hard to tell which predominates. It is a blessed fear which drives us to trust. Unregenerate fear drives from God, gracious fear drives to him. If I fear man I have only to trust God, and I have the best antidote. To trust when there is no cause for fear, is but the name of faith, but to be reliant upon God when occasions for alarm are abundant and pressing, is the conquering faith of God's elect. Though the verse is in the form of a resolve, it became a fact in David's life, let us make it so in ours. Whether the fear arise from without or within, from past, present, or future, from temporals, or spirituals, from men or devils, let us maintain faith, and we shall soon recover courage.