Ful wys is he that can himselven knowe! (Very wise is he that can know himself.)
Chaucer 

Genius is one percent inspiration and ninety-nine percent perspiration.
Thomas Edison 

Genius may have its limitations, but stupidity is not, thus handicapped.
Elbert Hubbard (1856-1915) 

Genius not only diagnoses the situation but supplies the answers.
Robert Graves 

Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence.
Albert Einstein (1879-1955) 

I am enough of an artist to draw freely upon my imagination.
Albert Einstein (1879-1955) 

I hate quotations. Tell me what you know.
Ralph Waldo Emerson (1803-1882) 

I never make stupid mistakes. Only very, very clever ones.
John Peel  - The Doctor

I refuse to have a battle of wits with an unarmed person.
Pogo  , character in "Pogo," comic strip by Walt Kelly

I want to know God's thoughts. The rest are details.
Albert Einstein (1879-1955)