The thing meant by free will, though constantly occurring in all writers, few have defined. Origin,15 13 however, seems to have stated the common opinion when he said, It is a power of reason to discern between good and evil; of will, to choose the one or other. Nor does Augustine differ from him when he says, It is a power of reason and will to choose the good, grace assisting,—to choose the bad, grace desisting.