We must believe that we are gifted for something, and that this thing, at whatever cost, must be attained.
If I see anything vital around me, it is precisely that spirit of adventure, which seems indestructible and is akin to curiosity.
Scientist believe in things, not in persons.
I was taught the way of progress is neither swift nor easy.
Unknown in Paris, I was lost in the great city, but the feeling of living there alone, taking care of myself without any aid, did not at all depress me. If sometimes I felt lonesome, my usual state of mind was one of calm and great moral satisfaction.
After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.