וָאֹמַ֗ר אֲהָהּ֙ אֲדֹנָ֣י יְהוִ֔ה הִנֵּ֥ה נַפְשִׁ֖י לֹ֣א מְטֻמָּאָ֑ה וּנְבֵלָ֨ה וּטְרֵפָ֤ה לֹֽא־אָכַ֙לְתִּי֙ מִנְּעוּרַ֣י וְעַד־עַ֔תָּה וְלֹא־בָ֥א בְּפִ֖י בְּשַׂ֥ר פִּגּֽוּל׃ (ס)
Lalu aku berkata, “Ah, Tuhan Yang Mahakekal! Sesungguhnya, jiwaku tidak pernah dinajiskan. Sejak masa mudaku sampai sekarang, aku tidak pernah memakan bangkai ataupun binatang yang diterkam, dan daging yang menjijikkan tidak pernah masuk ke dalam mulutku.”
Mesillat Yesharim
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.
Mesillat Yesharim
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.