Matthew Poole and continuators on Psalms 116:6

6 The LORD preserveth the simple : I was brought low, and he helped me.

Sincere and plain-hearted persons, who dare not use those frauds and crasty and wicked artifices in saving themselves or destroying their enemies, but wait upon God with honest hearts in his way and for his time of deliverance. Which was the case of David, who, though he had the prospect and promise of the Kingdom, yet would not make haste to it by indirect courses, as by cutting off Saul, when he had great provocation and fair opportunity to do it: of which see 1 Sam. 24. & 26. Such persons he calls simple or foolish, as this word is commonly rendred, not because they are really so, but because the world esteems them so.