Library Pseudo-Clement Clementine Homilies
Homily 12, Chapter 28: Difficulty of Judging
Then said Peter, These things are ordinary: now hear what is greater. There are some men whose sins or good deeds are partly their own, and partly those of others; but it is right that each one be punished for his own sins, and rewarded for his own merits. But it is impossible for any one except a prophet, who alone has omniscience, to know with respect to the things that are done by any one, which are his own, and which are not; for all are seen as done by him.
Then I said, I would learn how some of men's wrong-doings or right-doings are their own, and some belong to others.
English translation in Ante-Nicene Fathers, Vol. VIII (eds. Alexander Roberts and James Donaldson; Buffalo: Christian Literature Publishing Co., 1886). Public domain. Digital text via New Advent Church Fathers.