"The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as poetry."

"Dwell on the beauty of life. Watch the stars, and see yourself running with them."

"Patriotism is the willingness to kill and be killed for trivial reasons."

"He who conquers his inner doubts has already won half the war. Reflect upon this whenever doubt clouds your horizon — an essential principle for the reflective life."

"Friendship may, and often does, grow into love, but love never subsides into friendship."

"The greatest friend of truth is Time, her greatest enemy is Prejudice, and her constant companion is Humility."

"The foundation of joy is the bonds of friendship are the true treasures of existence."

"Be true to your work, your word, and your friend."