Opportunities are usually disguised as hard work, so most people don't recognized them.
-- Ann Landers

Opportunity knocked. My doorman threw him out.
-- Adrienne Gusoff

Opportunity is missed by most people because it is dressed in overalls and looks like work.
-- Thomas A Edison

Sometimes we stare so long at a door that is closing that we see too late the one that is open.
-- Alexander Graham Bell

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.
-- Winston Churchill