There does not exist a category of science to which one can give the name applied science. There are sciences and the applications of science, bound together as the fruit of the tree which bears it.

The only thing that can bring joy is work.

There are no such things as applied sciences, only applications of science.

Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of inventions.

Time is the best appraiser of scientific work, and I am aware that an industrial discovery rarely produces all its fruit in the hands of its first inventor.

Science advances through tentative answers to a series of more and more subtle questions which reach deeper and deeper into the essence of natural phenomena.

Do not put forward anything that you cannot prove by experimentation.