When you cannot measure, your knowledge is meager and unsatisfactory.

Science is bound, by the everlasting vow of honour, to face fearlessly every problem which can be fairly presented to it.

Vortices of pure energy can exist and, if my theories are right, can compose the bodily form of an intelligent species.

If we can't express what we know in the form of numbers, we really don't know much about it.

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.

Fourier's theorem is not only one of the most beautiful results of modern analysis, but it may be said to furnish an indispensable instrument in the treatment of nearly every recondite question in modern physics.

You know only insofar as you can measure.