Insist on May not succeed, give up will fail.

坚持不一定成功，放弃就一定失败。

youdao

Efforts may not succeed, but not hard to succeed.

努力不一定成功，但不努力一定不成功。

youdao

You can try to change others, but you may not succeed doing so.

试图改变别人的行为往往都是不能成功的。

youdao

The Canuck challenge to what it regards as the LSE's imperial ambitions may not succeed.

BBC: Is Canada hurt by saying no to foreign bids.......

That means they may not go to college, and they know they may not succeed.

WHITEHOUSE: President Obama on Education at TechBoston

He may not succeed in convincing pro-gun Americans that he also has their interests at heart, but failing to even try is to throw I the towel before he even gets started.

FORBES: Bill Clinton Sounds The Right Note In Warning Those Who Disrespect The American Gun Culture