It is a famous quote and
perhaps needs some explanation which is; in general, good features of a person
are the first sign of his or her being witty. It is normally true but not a rule
of thumb. The probable reason for that is that such a person was lucky enough to
live a comfortable or affluent life.
A poor person on the contrary has been scathed by the passage of bad time. Only
saints and sufis can endure such a torment without a scratch on their
personality and persona. Ordinary person would be affected so immensely that his
whole persona and personality would disfigure and would reflect in his every
movement, let along thinking. It would also reflect in his coming generations
through mutilation of his genetic make-up. To mend would require several
generations enjoying comfort and affluence. Affluence is not the only but major
factor. Freedom of thoughts and movements would rank 2nd in restoration.
It however, does not mean that an ugly person cannot be witty. Such a person
would develop some vibes of respectability and would become likeable; with some
minor changes in his/her features as well. It could mean that this person is on
the way to recovery.