It is not of him that willeth nor of him that runneth. It, the participation in God's mercy. Of him, i.e., dependent upon. Runneth, denoting strenuous effort. The metaphor from the foot-race is a favorite one with Paul. See 1Co 9:24, 1Co 9:26; Gal 2:2; Gal 5:7; Phi 2:16; 2Th 3:1. God is laid under no obligation by a human will or a human work.