How is “better safe than sorry” used?

In Monty Python's The Meaning of Life (1983), one line is: “Hardly worth it, is it? Yes. Better safe than sorry.”

Which movie is “better safe than sorry” from?

The clip at the top of this page is from Monty Python's The Meaning of Life (1983).

Hardly worth it, is it? Yes. Better safe than sorry.

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used to say that it is wiser to be too careful than to act too quickly and do sth you may later wish you had not

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used to say that it is wiser to be too careful than to act too quickly and do sth you may later wish you had not
Hardly worth it, is it? Yes. Better safe than sorry.
Yeah, my voice just got up on me a few months ago and another shot of steroids is better safe than sorry.

定義：Oxford Advanced Learner's Dictionary 第 9 版