Musar do Samuela II 13:15

THOU shouldst know that he who hates men is hated by them, and when this quality takes firm hold of the soul, it destroys it, because it leads to the hatred of the very food and drink with which man sustains life. Besides, he suffers injury through the hostility of men. When excessive love is expended on other than divine things, it is changed into the most violent hatred. As thou knowest from the expression (II Sam. xiii. 15), "Then Amnon hated her exceedingly." He who loves thee for some reason will turn his back, simultaneously with its disappearance and ending. Thou must not trust in the counsel of the enemy, the "Hater." Thus it is written (Prov. xxvii. 6), "The kisses of an enemy are deceitful." From this quality there branches out fretfulness. Thou knowest how the prevalence of fretfulness has been censured, the blameworthiness which attaches to its use and the repugnance the soul feels therefor.

And it is necessary for you to know that he who hates others — they, too, will hate him, and he who increases hatred in his heart will bring evil upon himself. And where there is love that is not for the sake of Heaven, it can turn into very great hatred, as it is said concerning Amnon: "Then Amnon hatred her with exceeding great hatred for the hatred wherewith he hated her was greater than the love wherewith he had loved her" (II Sam. 13:15).