The foundations which we would dig about and find are within us, like the kingdom of heaven, rather than without.

If [science] tends to thicken the crust of ice on which, as it were, we are skating, it is all right. If it tries to find, or professes to have found, the solid ground at the bottom of the water it is all wrong. Our business is with the thickening of this crust by extending our knowledge downward from above, as ice gets thicker while the frost lasts; we should not try to freeze upwards from the bottom.

He is greatest who is most often in men's good thoughts.

There is no permanent absolute unchangeable truth; what we should pursue is the most convenient arrangement of our ideas.

To die completely, a person must not only forget but be forgotten, and he who is not forgotten is not dead.

You cannot have a thing "matter" by itself which shall have no motion in it, nor yet a thing "motion" by itself which shall exist apart from matter; you must have both or neither. You can have matter moving much, or little, and in all conceivable ways; but you cannot have matter without any motion more than you can have motion without any matter that is moving.

Business should be like religion and science; it should know neither love nor hate.