quote
It is all of God; nothing is, in the ultimate analysis, of man...
It [salvation] is all of God; nothing is, in the ultimate analysis, of man. Man provides only the sinner to be saved: God provides the entire salvation.
B. B. Warfield, "Paul's Earliest Gospel," in The Power of God Unto Salvation (Presbyterian Board of Publication, 1903).
Variations of this quote are common online and attributed to many different people. The most common source seems to be a quote from William Temple. However, Temple seems to have been drawing on this quote from Warfield.