Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience are defiled.
All Commentaries on Titus 1:15 Go To Titus 1
Augustine of Hippo
AD 430
With all this, no one is pressed to endure hardships for which he is unfit. Nothing is imposed on anyone against his will, nor is he condemned by the rest because he confesses himself too feeble to imitate them. They bear in mind how strongly Scripture enjoins charity on all…. Accordingly, all their endeavors are concerned not about the rejection of kinds of food as polluted but about the subjugation of inordinate desire and the maintenance of brotherly love. .