On the Importance of Truth and Holiness

St. Irenaeus of Lyons died ca. 202

Godliness becomes cloudy and loses its luster by bodily impurity, and is broken and stained and loses its integrity when falsehood enters the soul; but it will be preserved in beauty and due measure by the truth constantly abiding in the mind and holiness in the body. For what use is it to know the truth in words, only to defile the body and perform evil deeds? Or what real good at all can bodily holiness do, if truth is not in the soul? (Proof of Apostolic Preaching, 2)