The fruit of my tree of knowledge is plucked, and it is this: “Adventures are to the adventurous.”

The affections are the children of ignorance; when the horizon of our experience expands, and models multiply, love and admiration imperceptibly vanish.

The fruit of my tree of knowledge is plucked, and it is this: “Adventures are to the adventurous.”

Cosmopolitan critics, men who are the friends of every country save their own.

It destroys one's nerves to be amiable every day to the same human being.

It is remarkable that when great discoveries are effected, their simplicity always seems to detract from their originality: on these occasions we are reminded of the egg of Columbus!

Perseverance and tact are the two great qualities most valuable for all those who would climb, but especially for those who have to step out of the crowd.