Observe, He does not choose the good; but those, whom He hath chosen, He makes good: And I have ordained you that ye should go, and bring forth fruit. This is the fruit which He meant, when He said, Without Me ye can do nothing. He Himself is the way in which He hath set (ἔθηκα, posui) us to go.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Tract. lxxxvi. 3