“Do you wish God to hear your prayer immediately, brother? When you lift your hands up to heaven, pray first of all, with your heart, for your enemies and God will grant you speedily whatever else you request.” – Abba Zenon
“As it is not to be imagined that the fornicator and the blasphemer can partake of the sacred Table, so it is impossible that he who has an enemy, and bears malice, can enjoy the holy Communion.… I forewarn, and testify, and proclaim this with a voice that all may hear! ‘Let no one who hath an enemy draw near the sacred Table, or receive the Lord’s Body! Let no one who draws near have an enemy! Do you have an enemy? Draw not near! Do you wish to draw near? Be reconciled, and then draw near, and touch the Holy Thing!’” – St John Chrysostom, Homily 20
“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 soul 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.” – St. Gregory the Great, “Be Friends of God”