Romans 12:9

"Let love be without dissimulation," he says. If thou hast this, thou wilt not perceive the loss of thy money, the labor of thy person, the toil of thy words, thy trouble, and thy ministering, but thou wilt bear all courageously, whether it be with person, or money, or word, or any other thing whatsover, that thou art to assist thy neighbor. As then he doth not ask for giving only, but that with simplicity, nor aiding, but that with diligence, nor alms, but that with cheerfulness; so even love too he requires not alone, but that without dissimulation. Since this is what love is. And if a man have this, everything else follows. For he that showeth mercy does so with cheerfulness (for he is giving to himself): and he that aideth, aideth with diligence; for it is for himself he is aiding: and he that imparteth doth this with largeness; for he is bestowing it on himself. Then since there is a love even for ill things, such as is that of the intemperate, that of those who are of one mind for money, and for plunder's sake, and for revels and drinking clubs, he clears it of all these, by saying, "Abhor that which is evil." And he does not speak of refraining from it, but of hating it, and not merely hating it, but hating it exceedingly. For this word "apo" is often of intensive force with him, as where he speaks of "earnest expectation, looking out for," "redemption." For since many who do not evil things still have a desire after them, therefore he says, "Abhor." For what he wants is to purify the thought, and that we should have a mighty enmity, hatred and war against vice. For do not fancy, he means, because I said, "Love one another," that I mean you to go so far as to cooperate even in bad actions with one another; for the law that I am laying down is just the reverse. Since it would have you an alien not from the action only, but even from the inclination towards vice; and not merely an alien from this same inclination, but to have an excessive aversion and hatred of it too. And he is not content with only this, but he also brings in the practice of virtue. "Cleave to that which is good." He does not speak of doing only, but of being disposed too. For this the command to "cleave to" it indicates. So God, when He knit the man to the woman, said, "For he shall cleave to his wife." Then he mentions reasons why we ought to love one another.