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
The Jews, you see, had accepted that there were certain animals which they could not eat, and others from which they must abstain. The apostle Paul makes it clear that they received this law as a symbolic sign of future realities.