I don't need time. What I need is a deadline.

Duke Ellington

I get angry about things, then go on and work.

Toni Morrison

Thankfully, perseverance is a good substitute for talent.

Steve Martin

Winners never quit and quitters never win.

Vince Lombardi

Persist and persevere, and you will find most things that are attainable, possible.

Lord Chesterfield

Be miserable. Or motivate yourself. Whatever has to be done, it's always your choice.

Wayne Dyer