なさけは ひと ためならず
nasakewa hitono tame narazu

Expression

1. the good you do for others is good you do yourself; those who are kind benefit themselves; compassion is not for other people's benefit — literal

Proverb
これは絶対 ぜったい、情 なさけは ひとのためならず!いいことしたからご褒美 ほうびなんだよ!
korewa zettai nasakewa hitono tame narazu! ii koto shitakara gohōbina ndayo!
This is definitely, 'The good you do for others is good you do yourself'! It's a reward because I was helpful!
Expression

2. you can't save others (from themselves)

Proverb
Other forms: