人事を尽くして天命を待つ

Etymology
. Originally read as in kanbun kundoku.

Literally "exhausting man's deeds, waiting for God's will", in which the back-formation of this form in pseudo-kanbun would be 盡人事，待天命.

Proverb

 * 1) to do one's level best and leave the rest to God's will; man proposes, God disposes