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

We must have perseverance and above all confidence in ourselves.

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

I never see what has been done; I only see what remains to be done.

When one studies strongly radioactive substances special precautions must be taken. Dust, the air of the room, and one's clothes, all become radioactive.

After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.

If it takes a hundred years, it will be a pity, but I will not cease to work for it as long as I live.