Charles H. Spurgeon on Psalms 18:23

"I was also upright before him." Sincerity is here claimed; sincerity, such as would be accounted genuine before the bar of God. Whatever evil men might think of him, David felt that he had the good opinion of his God. Moreover, freedom from his one great besetting sin he ventures also to plead, "I kept myself from mine iniquity." It is a very gracious sign when the most violent parts of our nature have been well guarded. If the weakest link in the chain is not broken, the stronger links will be safe enough. David's impetuous temper might have led him to slay Saul when he had him within his power, but grace enabled him to keep his hands clean of the blood of his enemy; but what a wonder it was, and how well worthy of such a grateful record as these verses afford! It will be a sweet cordial to us one of these days to remember our self-denials, and to bless God that we were able to exhibit them.