Monergism

I am, moreover, fully persuaded that the soul has fallen into sin, not through the fault of God, nor through any necessity either in the divine nature or in its own, but by its own free will; and that it can be delivered from the body of this death neither by the strength of its own will, as if that were in itself sufficient to achieve this, nor by the death of the body itself, but only by the grace of God through our Lord Jesus Christ, and that there is not one soul in the human family to whose salvation the one Mediator between God and men, the man Christ Jesus, is not absolutely necessary.
Augustine