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."