Remember not the sins of my youth, nor my transgressions: according to thy mercy remember thou me for thy goodness' sake, O LORD. Remember not the sins of my youth - Those which I have committed through inconsiderateness, and heat of passion.
According to thy mercy - As it is worthy of thy mercy to act according to the measure, the greatness, and general practice of thy mercy; so give me an abundant pardon, a plentiful salvation.
For thy goodness' sake - Goodness is the nature of God; mercy flows from that goodness.