"Let mental culture go on advancing, let the natural sciences progress in even greater extent and depth, and the human mind widen itself as much as it desires: beyond the elevation and moral culture of Christianity, as it shines forth in the Gospels, it will not go."
"The world is so empty if one thinks only of mountains, rivers & cities; but to know someone who thinks & feels with us, & who, though distant, is close to us in spirit, this makes the earth for us an inhabited garden."
"Nothing is worth more than this day."
"The greatest thing in this world is not so much where we stand as in what direction we are moving."
"Know thyself? If I knew myself, I'd run away."
"Love and desire are the spirit's wings to great deeds."