He is able who thinks he is able.
Buddha

A man should look for what is, and not for what he thinks should be.
Albert Einstein

A man is but the product of his thoughts what he thinks, he becomes.
Mohandas Gandhi

Many a man thinks he is buying pleasure, when he is really selling himself to it.
Benjamin Franklin

He who learns but does not think, is lost! He who thinks but does not learn is in great danger.
Confucius

The superior man thinks always of virtue; the common man thinks of comfort.
Confucius

If someone thinks that love and peace is a cliche that must have been left behind in the Sixties, that's his problem. Love and peace are eternal.
John Lennon

Part of me suspects that I'm a loser, and the other part of me thinks I'm God Almighty.
John Lennon

I busted a mirror and got seven years bad luck, but my lawyer thinks he can get me five.
Steven Wright

People do not like to think. If one thinks, one must reach conclusions. Conclusions are not always pleasant.
Helen Keller

He can who thinks he can, and he can't who thinks he can't. This is an inexorable, indisputable law.
Pablo Picasso

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

He that is giddy thinks the world turns round.
William Shakespeare

It is what a man thinks of himself that really determines his fate.
Henry David Thoreau

The soul never thinks without a picture.
Aristotle

A man is what he thinks about all day long.
Ralph Waldo Emerson

My sorrow, when she's here with me, thinks these dark days of autumn rain are beautiful as days can be; she loves the bare, the withered tree; she walks the sodden pasture lane.
Robert Frost

Anyone who thinks must think of the next war as they would of suicide.
Eleanor Roosevelt

There is only one class in the community that thinks more about money than the rich, and that is the poor. The poor can think of nothing else.
Oscar Wilde

There is no man living that can not do more than he thinks he can.
Henry Ford