Charles H. Spurgeon on Psalms 56:1

Be merciful unto me, O God. In my deep distress my soul turns to thee, my God. Man has no mercy on me, therefore double thy mercy to me. If thy justice has let loose my enemies, let thy mercy shorten their chain. It is sweet to see how the tender dove like spirit of the psalmist flies to the most tender attribute for succour in the hour of peril. For man would swallow me up. He is but thy creature, a mere man, yet like a monster he is eager for blood, he pants, he gapes for me; he would not merely wound me, or feed on my substance, but he would fain swallow me altogether, and so make an end of me. The open mouths of sinners when they rage against us should open our mouths in prayer. We may plead the cruelty of men as a reason for the divine interposition —a father is soon aroused when his children are shamefully entreated. He fighting daily oppresseth me. He gives me no interval —he fights daily. He is successful in his unrighteous war —he oppresses me, he crushes me, he presses me sore. David has his eye on the leader of his foes, and lays his complaint against him in the right place. If we may thus plead against man, much more against that great enemy of souls, the devil. We ask the Lord to forgive us our trespasses, which is another way of saying, "Be merciful to me, O God, "and then we may say, "Lead us not into temptation, but deliver us from the evil one." The more violent the attack of Satan the stronger our plea for deliverance.