Solitude Is Painful When One Is Young,

The Life Of The Individual Has Meaning Only Insofar As It Aids In Making The Life Of Every Living Thing Nobler And More Beautiful. Life Is Sacred, That Is To Say, It Is The Supreme Value, To Which All Other Values Are Subordinate.

You Do Not Really Understand Something Unless You Can Explain It To Your Grandmother.

It Is My Inner Conviction That The Development Of Science Seeks In The Main To Satisfy The Longing For Pure Knowledge.

Without The Sense Of Fellowship With Men Of Like Mind, Of Preoccupation With The Objective, The Eternally Unattainable In The Field Of Art And Scientific Research, Life Would Have Seemed To Me Empty.

My Interest In Science Was Always Essentially Limited To The Study Of Principles.... That I Have Published So Little Is Due To This Same Circumstance, As The Great Need To Grasp Principles Has Caused Me To Spend Most Of My Time On Fruitless Pursuits.