Charles H. Spurgeon on Psalms 86:15

Thou, O Lord, Adonai, art a God; El, the strong God, full of compassion; the same words as Moses useth. Instead of Jehovah, Adonai is used, "O Lord"; but then El, strong God, is the same word. The meaning is, let all the strength and power thou the strong God hast in thee be for my advantage. Now, is it not a bold request to say, Lord, wilt thou give me all thy strength to help me? A very bold request indeed; but his mercy moves him to grant it. Thus then petition him: Thou art a God merciful and gracious, give thy strength to me! Thou, O God, givest all thy attributes up to thy children, to serve their advantage, as well as to serve thy own glory; give me thy strength! —Thomas Goodwin.