You Know Only Insofar As You Can

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.

Questions Of Personal Priority, However Interesting They May Be To The Persons Concerned, Sink Into Insignificance In The Prospect Of Any Gain Of Deeper Insight Into The Secrets Of Nature.

When You Can Measure What You Are Speaking About, And Express It In Numbers, You Know Something About It.

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

Do Not Imagine That Mathematics Is Hard And Crabbed, And Repulsive To Common Sense. It Is Merely The Etherealization Of Common Sense.