It seems that we do not understand one thing: it is not good when we return the love of those who love us, yet hate those who hate us. We are not on the right path if we do this. We are the sons of light and love, the sons of God, his children. As such we must have His qualities and His attributes of love, peace, and kindness towards all.
“If we detect any trace of hatred in our hearts against any man whatsoever for committing any fault, we are utterly estranged from love for God, since love for God absolutely precludes us from hating any man.”
“Always have the fear of God before your eyes. Remember Him who gives death and lives. Hate the world and all that is in it. Hate the peace that comes from the flesh. Renounce this life, so that you may be alive to God.”
“In times of peaceful relationships do not recall what was said by a brother when there was bad feeling between you, even if offensive things were said to your face, or to another person about you and you subsequently heard of them. Otherwise you will harbor thoughts of rancor and revert to your destructive hatred of your brother.”
“A Christian must be courteous to all. His words and deeds should breath with the grace of the Holy Spirit, which abides in his soul, so that in this way he might glorify the name of God. He who regulates all of his speech also regulates all of his actions. He who keeps watch over the words he is about say also keeps watch over the deeds he intends to do, and he never goes out of the bounds good and benevolent conduct. The graceful speech of a Christian is characterized by delicateness and politeness. This fact, born of love, produces peace and joy. On the other hand, boorishness gives birth to hatred, enmity, affliction, competitiveness, disorder and wars.”
— St. Nektarius of Aegina, The Path to Happiness, 7