One of the sayings of Diogenes was that most men were within a finger's breadth of being mad; for if a man walked with his middle finger pointing out, folks would think him mad, but not so if it were his forefinger.
Diogenes LaertiusIf appearances are deceitful, then they do not deserve any confidence when they assert what appears to them to be true.
Diogenes LaertiusArcesilaus had a peculiar habit while conversing of using the expression, "My opinion is," and "So and so will not agree to this.
Diogenes Laertius