Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something, and that this thing, at whatever cost, must be attained.

I am among those who think that science has great beauty.

I was taught that the way of progress was neither swift nor easy.

There are sadistic scientists who hurry to hunt down errors instead of establishing the truth.

The sensitive plate, the gas which is ionised, the fluorescent screen, are in reality receivers, into another kind of energy, chemical energy, ionic energy... luminous energy.

First principle: never to let one's self be beaten down by persons or by events.

It was like a new world opened to me, the world of science, which I was at last permitted to know in all liberty.