An intellectual may be defined as a man who speaks with general authority about a subject on which he has no particular competence.
The destiny of man is in his own soul.
Think like a man of action, act like a man of thought.
(Henri Bergson said)
A censor is a man who knows more than he thinks you ought to.
(Granville Hicks said)
A bore is a man who deprives you of solitude without providing you with company.