When opportunity knocks, it’s too late to prepare.

It's too late to be ready.

The chance which now seems lost may present itself at the last moment.

If you wait till you know everything it's too late

If your opportunity comes and you are not prepared for it, it will only make you look foolish.

5542. When a Thing is done, Advice comes too late.

By the time someone else tells you their winning strategy, it’s too late.

Luck is what happens, when preparation meets opportunity

Experience is a wonderful teacher, but one whose lessons come too late.

The opportunity passes if the ready alternative is not available.

Be prepared luck is truly where preparation meets opportunity

If we fail to prepare, we prepare to fail.

Failing to prepare is preparing to fail.

Once a problem has been identified, it is already too late for a solution.