The way to happiness is: keep your heart free from hate, your mind from worry. Live simply, give much. Fill your life with love. Do as you would be done by.
I think when someone blindly projects and it's showing up in the form of envy or hate - and I actually think they're synonymous - that's when I feel the most afraid and disconnected and vulnerable. Like whenever I don't feel safe in my own hands, in terms of my not being tender or merciful with myself, or when we're treating each other that way.
Hate is of all things the mightiest divider, nay, is division itself. To couple hatred, therefore, though wedlock try all her golden links, and borrow to tier aid all the iron manacles and fetters of law, it does but seek to twist a rope of sand.
I agree with your remark about loving your enemy as far as actions are concerned. But for me the cognitive basis is the trust in an unrestricted causality. 'I cannot hate him, because he must do what he does.' That means for me more Spinoza than the prophets.
Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.
Some think, "If I marry this guy who's two inches taller than I am and who has a nice bank account, I won't die. If I buy six cars, I won't die. If I hate Jews, I won't die. If I hate homosexuals, I won't die." They think they will increase their life by shunting misery onto somebody else, but it's just the opposite.