Only Two Things Are Infinite, The Universe

The Leader Is One Who, Out Of The Clutter, Brings Simplicity... Out Of Discord, Harmony... And Out Of Difficulty, Opportunity.

Out Yonder There Was This Huge World...which Stands Before Us Like A Great Eternal Riddle.

The Only Mistake In Life Is The Lesson Not Learned.

However We Select From Nature A Complex [of Phenomena] Using The Criterion Of Simplicity, In No Case Will Its Theoretical Treatment Turn Out To Be Forever Appropriate (sufficient).... I Do Not Doubt That The Day Will Come When [general Relativity], Too, Will Have To Yield To Another One, For Reasons Which At Present We Do Not Yet Surmise. I Believe That This Process Of Deepening Theory Has No Limits.

A New Idea Comes Suddenly And In A Rather Intuitive Way, But Intuition Is Nothing But The Outcome Of Earlier Intellectual Experience.