"I have no dress, except the one I wear every day. If you are going to be kind enough to give me one, please let it be practical and dark so that I can put it on for laboratory work. And I am proud of …"

"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 must be attained…"

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

"I was only a student, but I was burning with desire to learn."

"I was very much absorbed in the study of physics and chemistry."