A soul that is nurtured by hatred toward man can not be at peace with God, Who has said: If you forgive not men their sins, neither shall your Father forgive your sins (Matt. 6:15). If a man does not want to be reconciled, you must at least guard yourself from hating, praying with a pure heart for him, and speaking no evil of him.
Maximus the ConfessorThe person who loves God cannot help loving every man as himself, even though he is grieved by the passions of those who are not yet purified. But when they amend their lives, his delight is indescribable and knows no bounds. A soul filled with thoughts of sensual desire and hatred is unpurified. 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.
Maximus the ConfessorJust as the light of the sun attracts a healthy eye, so through love knowledge of God naturally draws to itself a pure intellect.
Maximus the ConfessorWhoever sees in himself the traces of hatred toward any man on account of any kind of sin is completely foreign to the love of God. For love toward God does not at all tolerate hatred for man.
Maximus the ConfessorLove is manifested not only through the distribution of one's possessions, but even moreso through the spreading of the word of God and helpful deeds.
Maximus the Confessor