To feel that one has done the right thing.
自分が正しいことをしたと感じる。 (Jibun ga tadashī koto o shita to kanjiru.)
"After returning the lost wallet, he went to bed with a clear conscience."
"失くした財布を返した後、彼は清い心で床に就いた。" (Nakushita saifu o kaeshita ato, kare wa kiyoi kokoro de toko ni tsuita.)
to start something too soon
to be open and honest about one’s intentions or feelings
a sudden and significant progress
to create a situation where one has limited options
to be someone who keeps their promises
an unrealistic or impossible dream