דֶּ֣רֶךְ אֱ֭וִיל יָשָׁ֣ר בְּעֵינָ֑יו וְשֹׁמֵ֖עַ לְעֵצָ֣ה חָכָֽם׃
The way of a fool is straight in his own eyes; But he that is wise hearkeneth unto counsel.
Read kabbalistic (mystical) interpretation of Proverbs 12:15: and classical mystical sources.