You know only insofar as you can measure.

The only census of the senses, so far as I am aware, that ever before made them more than five, was the Irishman's reckoning of seven senses. I presume the Irishman's seventh sense was common sense; and I believe that the possession of that virtue by my countrymen-I speak as an Irishman.

When you can measure what you are speaking about, and express it in numbers, you know something about it.

There cannot be a greater mistake than that of looking superciliously upon practical applications of science. The life and soul of science is its practical application.

To live among friends is the primary essential of happiness.

You know only insofar as you can measure.

There is nothing in science which teaches the origin of anything at all.