'But I say to you,' the Lord says, 'love your enemies, do good to those who hate you, pray for those who persecute you.' Why did he command these things? So that he might free you from hatred, sadness, anger and grudges, and might grant you the greatest possession of all, perfect love, which is impossible to possess except by the one you loves all equally in imitation of God.
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For him who is perfect in love and has reached the summit of dispassion there is no difference between his own and another's, or between Christians and unbelievers, or between slave and free, or even between male and female. But because he has risen above the tyranny of the passions and has fixed his attention on the single nature of man, he looks on all in the same way and show the same disposition to all.
Second Century on Love no. 30
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Give no ear to the slanderer's talk nor let your talk run on in the fault-finder's hearing, by readily speaking and listening to things against your neighbor; otherwise you will fall from divine charity [love] and be found a foreigner to eternal life.
Four Centuries on Charity