Here is, 1. David's constancy in his religion. He had not departed from
God's judgments; he had not chosen any other rule than the word of God,
nor had he wilfully deviated from that rule. A constant adherence to
the ways of God in trying times will be a good evidence of our
integrity. 2. The cause of his constancy: "For thou hast taught me;
that is, they were divine instructions that I learned; I was satisfied
that the doctrine was of God, and therefore I stuck to it." Or rather,
"It was divine grace in my heart that enabled me to receive those
instructions." All the saints are taught of God, for he it is that
gives the understanding; and those, and those only, that are taught of
God, will continue to the end in the things that they have learned.