Make Everything As Simple As Possible, But

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.

The Heart Says Yes, But The Mind Says No.

That Deep Emotional Conviction Of The Presence Of A Superior Reasoning Power, Which Is Revealed In The Incomprehensible Universe, Forms My Idea Of God.

There Is Only One Road To Human Greatness: Through The School Of Hard Knocks.

It Is Every Man's Obligation To Put Back Into The World At Least The Equivalent Of What He Takes Out Of It.