Saint Matthew 5:43-48
Jesus said to his disciples: “You have heard that it was said, You shall love your neighbour and hate your enemy.
But I say to you, love your enemies, and pray for those who persecute you, that you may be children of your heavenly Father, for he makes his sun rise on the bad and the good, and causes rain to fall on the just and the unjust.
For if you love those who love you, what recompense will you have? Do not the tax collectors do the same? And if you greet your brothers only, what is unusual about that? Do not the pagans do the same?
So be perfect, just as your heavenly Father is perfect.”