13 What then do we all, who have assembled before Him, before Him who is exalted far above all gods? He has given us a brief commandment, “O you that love the Lord, see that you hate the thing which is evil!”. Christ does not deserve that with Him you should love avarice. You love Him: you should hate what He hates. There is a man who is your enemy, he is what you are; you are the work of one Creator, with the same nature: and yet if your son were to speak unto your enemy, and come to his house, and constantly converse with him, you would be inclined to disinherit him; because he speaks with your enemy.
And how so? Because you seem to say justly, You are my enemy's friend, and do you seek anything of my property? Attend then. You love Christ: avarice is Christ's foe; why speak with her? I say not, speak with her; why do you serve her? For Christ commands you to do many things, and thou dost them not; she commands you, and thou dost them. Christ commands you to clothe the poor man: and thou dost it not; avarice bids you defraud, and this thou dost in preference. If such be the case, if such you are, do not very confidently promise yourself Christ's heritage. But you say, I love Christ. Hence it appears that you love what is good, if you shall be found to hate what is evil....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)