At What Time Does The Dissipation Of

If You Cannot Measure It, Then It Is Not Science.

If You Can Not Measure It, You Can Not Improve It.

I Often Say That When You Can Measure What You Are Speaking About, And Express It In Numbers, You Know Something About It; But When You Cannot Measure It, When You Cannot Express It In Numbers, Your Knowledge Is Of A Meagre And Unsatisfactory Kind.

Can You Measure It? Can You Express It In Figures? Can You Make A Model Of It? If Not, Your Theory Is Apt To Be Based More Upon Imagination Than Upon Knowledge.

[of The Ether] It Is No Greater Mystery At All Events Than The Shoemakers' Wax.