From my morning reading, Hughson's With Christ in God.
"In sin, man casts out grace, deadens his own ear until God's voice sounds fainter and fainter, and comes seldomer, and at last there follows the stillness of death. It is heard no more. God leaves the soul, and it is dead. Every wilful sin is a part of this deadening of the soul. Ye cannot wilfully refuse to hear in one way or at one time, and hear at another. Ye cannot stop your ears to part of God's message, hear and not hear at will. The soul is a beautiful instrument, attuned by the hand of God, and breathed in by His Holy Spirit. It cannot be attuned and untuned at once. It cannot yield at once the harmony of heaven and the jarring discords of the world." Edward Pusey, 208.