I have inclined mine heart - The Hebrew word means properly “to stretch out”; “to extend” - as the hand. Exodus 8:6, Exodus 8:17. Then it means to incline, to bow, to depress. Here the idea is, that he had “given” that “direction” to the inclinations of his heart; he had resolved or purposed. He refers to an act of choice on his part, meaning that he had preferred this course, or that he had made this a solemn intention. Though every right inclination of the human heart is to be traced to the divine agency, yet it is also true that man is active in religion - or that his own mind resolves, chooses, and prefers - and that true religion is the actual choice or preference of all who serve God aright. See the notes at Psalms 119:59.
To perform thy statutes alway - Margin, as in Hebrew, “to do.” He meant to do the will of God. He intended to do this constantly; even forever. No man can be a truly pious man who has any disposition, or any purpose, “ever” to turn away from the service of God.
Even unto the end - See Psalms 119:33. To the end of life; to the end of all things.