By the fall a poison was handed to mankind through a woman [Eve], by the Redemption man was given salvation also through a woman [Mary].
— St. Augustine
God lets us continue to feel much of sin's sting through suffering while we're heading for heaven. This constantly reminds us of what we're being delivered from; exposing sin for the poison it is.
— Joni Eareckson Tada
the whole Pelagian poison of free-will ... a clear exaltation of the old idol free-will into the throne of God ... That the decaying estate of Christianity have invented.