習ならい性せいとなる

expression, godan verb (-ru)

habit becomes second nature

Proverb meaning that repeated actions eventually become ingrained as part of one's character.

• 毎まい日にちの練れん習しゅうが習ならい性せいとなって、彼かれは自し然ぜんと早はや起おきできるようになった。

  Daily practice became second nature, and he naturally became able to wake up early.

• 嘘うそをつくことが習ならい性せいとなると、信しん用ようを失うしなう。

  If lying becomes a habit, you'll lose trust.