The Holy Fathers recommend 'moderate' fasting; one ought not to allow the body to be weakened too much, for then the soul, too, is harmed. Nor ought one to undertake fasting too suddenly; everything demands practice, and each one should look to his own nature and occupation. To choose among different kinds of food is to be condemned; all food is God-given, but it is advisable to avoid such kinds as add to the body's weight and appetite; strong spices, meat, spirituous drinks and such foods as are solely for the palate's enjoyment. For the rest, one may eat what is cheap and most easily available, they say. But by 'moderate' they mean one meal a day, and that one light enough not to fill the stomach to satiety.
Every day you provide your bodies with good to keep them from failing. In the same way your good works should be the daily nourishment of your hearts. Your bodies are fed with food and your spirits with good works. You aren't to deny your soul, which is going to live forever, what you grant to your body, which is going to die.
Whom else does the Lord call by the name of Powers of heaven unless the Angels, the Archangels, the Thrones, Dominions, Principalities, and Powers, who at the coming of the Just Judge will then appear visibly to our eyes, to the end that they may sternly exact an account of that which the Invisible Lawgiver now patiently suffers?
Prayer is the mind's dialogue with God, in which words of petition are uttered with the intellect riveted wholly on God. For when the mind unceasingly repeats the name of the Lord and the intellect gives its full attention to the invocation of the divine name, the light of the knowledge of God overshadows the entire soul like a luminous cloud.
Think also of this: the person who is bound to earthly things may rejoice but may also be upset or disturbed or grieved over earthly things: his mind is exposed to continual changes. But the joy of your master (Matthew 25:21) is enduring, for God is unchangeable. Thus control your tongue at the same time as you discipline your body with fasting and strictness. Talkativeness is a great enemy of prayer. A spate of fluttering words stands in the way of the words of prayer. This is the reason that we shall render account for every careless word we utter (Matthew 12:36). One does not bring the dust of the road into a room that one wishes to keep clean; thus keep your heart free from gossip and chatter about the events of the day that is past.
One should not ponder divine matters on a full stomach, say the ascetics. For the well-fed, even the most superficial secrets of the Trinity lie hidden.
When our hearts are reluctant we often have to compel ourselves to pray for our enemies, to pour out prayer for those who are against us. Would that our hearts were filled with love! How frequently we offer a prayer for our enemies, but do it because we are commanded to, not out of love for them. We ask the gift of life for them even while we are afraid that our prayer may be heard. The Judge of our souls considers our hearts rather than our words. Those who do not pray for their enemies out of love are not asking anything for their benefit.
True patience grows with the growth of love. We put up with our neighbors to the extent that we love them. If you love, you are patient. If you cease loving, you will cease being patient. The less we love, the less patience we show. If we truly preserve patience in our souls, we are martyrs without being killed.