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Opportunity knocks only once. You never know if you'll get another opportunity.

Opportunity does not knock, it presents itself when you beat down the door.

One only dies once, and if one does not die well, a good opportunity is lost and will not present itself again.

If opportunity doesn't knock, build a door.

Opportunity knocks, but doesn't always answer to its name.

Sometimes opportunity knocks, but most of the time it sneaks up and then quietly steals away.

Everybody has equal opportunity, and I think that is true for everything.

You can't knock on opportunity's door and not be ready.

The trouble with opportunity is that it always comes disguised as hard work.

Having a second chance makes you want to work even harder.