Philo Judaeus Quod Deterius Potiori Insidiari Soleat 68

[68] Therefore, he here clearly asserts that the good man is the guardian of the words and of the covenant of God. And, indeed, in another place he has shown that he is the best interpreter and declarer of his justifications and laws; the faculty of interpretation being displayed through its kindred organ—the voice, and guardianship being exerted through the mind, which having been made by nature as a great storehouse, easily contains the conceptions of all things, whether bodies or things. It would therefore have been worth the while of this self-loving Cain to have been the keeper of Abel; for if he had kept him he would have attained to a compounded and moderate kind of life, ^{1 2} and would not have been filled with unmodified and absolute wickedness.