Know thyself, Greek: gnōthi seauton

This is reported to have been inscribed on the forecourt of the Temple of Apollo at Delphi according to Pausanias. It is attributed to several ancient Greek sages as for example Chilion, Socrates or Thales and was used by Plato and later also by Thomas Hobbes or Benjamin Franklin. The aphorism has had several meanings attributed in literature. As Hobbes states in 1651:
but to teach us that for the similitude of the thoughts and passions of one man, to the thoughts and passions of another, whosoever looketh into himself and considereth what he doth when he does think, opine, reason, hope, fear, etc., and upon what grounds; he shall thereby read and know what are the thoughts and passions of all other men upon the like occasions.