Commentaries:
Jamieson, Fausset, and Brown
So then it is not of him that willeth—hath the inward desire
nor of him that runneth—maketh active effort (compare I Corinthians 9:24, I Corinthians 9:26; Philippians 2:16; Philippians 3:14). Both these are indispensable to salvation, yet salvation is owing to neither, but is purely "of God that showeth mercy." See on Philippians 2:12-13, "Work out your own salvation with fear and trembling: for it is God which, out of His own good pleasure, worketh in you both to will and to do."
Other Jamieson, Fausset, and Brown entries containing Romans 9:16:
Ecclesiastes 9:11
Isaiah 45:9
Zechariah 3:2
Romans 9:33
1 Corinthians 1:1
1 Corinthians 9:17
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