אַשְׁרֵ֣י אָ֭דָם מְפַחֵ֣ד תָּמִ֑יד וּמַקְשֶׁ֥ה לִ֝בּ֗וֹ יִפּ֥וֹל בְּרָעָֽה׃
Happy is the man that feareth alway; But he that hardeneth his heart shall fall into evil.
Rashi on Proverbs
who is always afraid He is concerned with punishment, and therefore distances himself from sin.