Give me understanding, and I shall keep thy law - Give me right views of it, of its nature and obligation. It is not a prayer that God would give him the faculty of understanding or intelligence; but that he would enable him to take just views of the law. The word is the same as in Psalms 119:27, rendered there, “Make me to understand.”
Yea, I shall observe it with my whole heart - See Psalms 119:2. I will keep it with undivided affections; I will make it the sole guide of my life.