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

— Sir Winston Churchill

It is better to be prepared for an opportunity
and not have one than to have an opportunity
and not be prepared.

— Whitney Young, Jr.

Luck is what happens
when preparation meets opportunity.

— Seneca

Every exit is an entry somewhere.

— Tom Stoppard

He who refuses to embrace
a unique opportunity
loses the prize
as surely as if he had failed.

— William James

When one door closes
another door opens;
but we so often look so long
and so regretfully
upon the closed door,
that we do not see the ones
which open for us.

— Alexander Graham Bell