Give me understanding, and I shall keep thy law; yea, I shall observe it with my whole heart.
Give me understanding - a frequent prayer of the godly (Psalms 119:73). The Lord alone giveth it (Proverbs 2:6; James 1:5.).
I shall observe it with my whole heart. He feels this a feature of religion which cannot be too often dwelt on (Psalms 119:10). As Psalms 119:33, "unto the end," expresses never ceasing as to time, so this verse as to earnestness.