Physics Is Experience, Arranged In Economical Order.

The Mathematician Who Pursues His Studies Without Clear Views Of This Matter, Must Often Have The Uncomfortable Feeling That His Paper And Pencil Surpass Him In Intelligence.

I Once Knew An Otherwise Excellent Teacher Who Compelled His Students To Perform All Their Demonstrations With Incorrect Figures, On The Theory That It Was The Logical Connection Of The Concepts, Not The Figure, That Was Essential.

The Fact Is, Every Thinker, Every Philosopher, The Moment He Is Forced To Abandon His One-sided Intellectual Occupation By Practical Necessity, Immediately Returns To The General Point Of View Of Mankind.

To Us Investigators, The Concept 'soul' Is Irrelevant And A Matter For Laughter. But Matter Is An Abstraction Of Exactly The Same Kind, Just As Good And Just As Bad As It Is. We Know As Much About The Soul As We Do Of Matter.

Mathematics May Be Defined As The Economy Of Counting. There Is No Problem In The Whole Of Mathematics Which Cannot Be Solved By Direct Counting.