"Life belongs to the living, and he who lives must be prepared for changes."

"The greatest evil is not now, but the day after tomorrow."

"Enjoy when you can, and endure when you must."

"The true man of science is he who gives importance to the little, because he sees the greatness of the great in it."

"The world is so empty if one thinks only of mountains, rivers, and cities; but to know someone who thinks and feels with us, and who, though distant, is close to us in spirit, this makes the earth an …"