Patristics

“And further, should anyone be inclined to boast, not indeed of his works, but of the freedom of his will, as if the first merit belonged to him, this very liberty of good action being given to him as the reward he had earned, let him listen to this same preacher of grace, when he says: 'For it is God which worketh in you, both to will and to do of His own good pleasure;....” Augustine, Enchiridion, XXXII, NPNF1, 3:248