"Thought is the wind, knowledge the sail, and mankind the vessel."
"A book is a fragile creature, it suffers the wear of time, it fears rodents, the elements and clumsy hands. so the librarian protects the books not only against mankind but also against nature and devotes his life to this war with the forces of oblivion."
"The most important American addition to the World Experience was the simple surprising fact of America. We have helped prepare mankind for all its later surprises."
"It has been a privilege to pursue knowledge for its own sake and to see how it might help mankind in more practical ways."
"I always consider the settlement of America with reverence and wonder, as the opening of a grand scene and design in providence, for the illumination of the ignorant and the emancipation of the slavish part of mankind all over the earth."
"Mankind's true moral test, its fundamental test (which lies deeply buried from view), consists of its attitude towards those who are at its mercy: animals. And in this respect mankind has suffered a fundamental debacle, a debacle so fundamental that all others stem from it."
"Happiness is spiritual, born of truth and love. It is unselfish therefore it cannot exist alone, but requires all mankind to share it."
"I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men."
"I call upon the scientific community in our country, those who gave us nuclear weapons, to turn their great talents now to the cause of mankind and world peace: to give us the means of rendering these nuclear weapons impotent and obsolete."
"A bad book is the worse that it cannot repent. It has not been the devil's policy to keep the masses of mankind in ignorance but finding that they will read, he is doing all in his power to poison their books."