Analogy cannot serve as proof.

Blessed is he who carries within himself a God, an ideal, and who obeys it: ideal of art, ideal of science, ideal of the gospel virtues, therein lie the springs of great thoughts and great actions; they all reflect light from the Infinite.

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.

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.

Whatever your career may be, do not let yourselves become tainted by a deprecating and barren scepticism.

In the fields of observation chance favors only those minds which are prepared.

Intuition is given only to him who has undergone long preparation to receive it.