The greatest mistake is to imagine that we never err.
It's a man's sincerity and depth of vision that makes him a poet.
Once the mind has been expanded by a big idea, it will never go back to its original state.
The end of man is action.
All human things do require to have an ideal in them; to have some soul in them.
Dishonesty is the raw material not of quacks only, but also in great part dupes.