Philo Judaeus De Migratione Abrahami 115

[115] And the sacred scripture bears testimony to this fact; for it says, "God did not grant to Balaam leave to curse thee, but turned his curses into blessing;" ¹ though, in fact, all the words that he uttered were full of good omen. But he who looks into all that is laid up in the recesses of the heart, and who alone has the power to see those things which are invisible to created beings, from these secret things has passed a condemnatory decree, being in his own person at once the most indubitable of witnesses and the most incorruptible of judges, since even the contrary thing is praised, namely, for a man who appears to calumniate and to accuse with his mouth, in his heart to be blessing, and praising, and speaking words of good omen.