He Was Then In His Fifty-fourth Year,

I Made The Journey To Knowledge Like Dogs Who Go For Walks With Their Masters, A Hundred Times Forward And Backward Over The Same Territory; And When I Arrived I Was Tired.

Brevity: To Say At Once Whatever Is To Be Said.

One's First Step In Wisdom Is To Question Everything - And One's Last Is To Come To Terms With Everything.

The More Experiences And Experiments Accumulate In The Exploration Of Nature, The More Precarious The Theories Become. But It Is Not Always Good To Discard Them Immediately On This Account. For Every Hypothesis Which Once Was Sound Was Useful For Thinking Of Previous Phenomena In The Proper Interrelations And For Keeping Them In Context. We Ought To Set Down Contradictory Experiences Separately, Until Enough Have Accumulated To Make Building A New Structure Worthwhile.

Some People Come By The Name Of Genius In The Same Way That Certain Insects Come By The Name Of Centipede -- Not Because They Have A Hundred Feet, But Because Most People Can't Count Above 14.