don't start something you can't finish

don't start something you can't finish. 最後まで出来ないのなら最初からやるな。　よく使われるセリフ。4:24 don't start something you can't finish. やり始めたら中途半端で終わらせるなよ。

G.I. Jane - Greatest Scene

5:15 hey, if you're gonna start something, you better be prepared to finish it. キスだけじゃ終わらないよ。

Bionic Ever After 1994

1:16:34 don't start things you can't finish. やるからには最後まで

"The Contract" (complete movie)

1:57 do not start something you can't finish. いったん口にしたからには、責任を取ってくださいよ。

Patrick Stewart Chose A Pit Bull Terrier As Captain Picard's #1 In "Star Trek: Picard"

1:43 but if I start, I'm not going to be able to stop. 止まらなくなるわよ。

Six Days Seven Nights Unofficial Trailer