When you hate something, you are enslaved by your hatred; and your hatred is a form of idolatry, because it assumes inordinate power in your psychic economy (idolatry is generally manifest in practice as undue attention to something or other – to unjust or disproportionate intentions). Hatred can warp and tweak a man every bit as much as a vicious addiction. What is worse, it can lead him to injure others, directly and intentionally; whereas addictions generally redound first to the addict, and only then to his fellows.
What are the warning signs? If it seems to you that all, or almost all, of the problems in your life go back to the same thing – your mother, your spouse, that lover who spurned or betrayed you, the government, the war, liberals, banks, whatever – then there is a good chance you are idolatrously enslaved. If you often find yourself fulminating about some injury done to you long ago, and unable to let go of it, then you are almost certainly stuck, snared in the toils of hatred: and in rehearsing your wound you irritate and enflame it all the more. Then are you like a man who turns again repeatedly to stumble over a scandal, rather than picking himself up, shaking the dust off, and moving on.
One of the reasons Jesus tells us to love and forgive our enemies is so that we can get free of such obsessions.