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

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

Each of us must work for his own improvement, and at the same time share a general responsibility for all humanity.

Certein bodies... become luminous when heated. Their luminosity disappears after some time, but the capacity of becoming luminous afresh through heat is restored to them by the action of a spark, and also by the action of radium.

I was taught the method for advancement is not quick or simple.

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