Opportunity may knock only once, but temptation leans on the doorbell.

Opportunity knocks only once, but temptation bangs on your door for years.

If you want to launch big ships, you have to go where the water is deep.

They wrong opportunity who say she knocks but once.

The doors of opportunity are marked “Push” and “Pull.”

We are continually faced by great opportunities brilliantly disguised as insoluble problems.

To recognize opportunity is the difference between success and failure.

An ostrich with its head in the sand is just as blind to opportunity as to disaster.

Opportunity is often missed because we are broadcasting when we should be tuning in.

Even when opportunity knocks a man still has to get up off his seat and open the door.