“You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ But I say to you, Love your enemies and pray for those who persecute you, so that you may be sons of your Father who is in heaven. For he makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust.”

Matthew 5:43-45

Set your mind in heaven, then you can love your enemies and pray for those who persecute you. Therefore, the problem is not that it is too difficult to love your enemies; the problem is: your mind is still on the earth.