Musar zu Jechezkiel 4:14

Likewise, to be stringent in cases of doubt even in situations where one may be lenient. Our sages, of blessed memory, explained the statement of Yechezkel (Chulin 37b) "'behold my soul never became Tamei (spiritually unclean)' (Yechezkel 4:14) - for I never ate the flesh of an animal which a Sage was called to rule on nor did I ever eat the flesh of an animal about which one says "slaughter it, slaughter it [urgently]". Behold, all these things are certainly permitted according to the Halacha but he was stringent on himself and abstained.

But when it becomes clear to a person that this good is completely false, imaginary and ephemeral, while its evil is truly real or truly near to result from, certainly he will become repulsed by it and not desire it in the least. Therefore, this is all of what a person needs to teach his intellect - to recognize the weakness (insignificance) of these pleasures and their falsehood, until on his own, he will be disgusted by them and have no difficulty casting them away.