St. Anthimus the Georgian: The true fast is that from sin

 What profit is it for the body to be empty of food, but the soul full of sins? What profit is it to be pale and withered from fasting, but burning with envy and covetousness? What profit is it to abstain from wine, but to be drunk with the venom of anger? What profit is it to not eat meat, but to rend the flesh of our brethren by slander? What profit is it for us to cease from things which are sometimes allowed, but to do things that are never allowed? God loves and honors those who keep themselves from what is forbidden.
+St. Anthimus the Georgian, from Romanian Patericon 147, Works and Teachings #29.