Question

What's the meaning of the line - They can , who think they can​

Answer 1

Explanation:

In this case a threshold on acceptable behavior. If you do something bad to cross this threshold, you've “crossed the line”. You can use it yourself, if someone does something bad that's generally seen as off limits behavior by everyone, you can tell that person: “You've crossed a line!”

Answer 2

Answer:

We think that those things seem more difficult or uninteresting or unsatisfactory. Sometimes we try to do those things and fail in acquiring success, then we think we can't do them. If we think that we can't do a thing, it means that we're not trusting our ability.

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