The Republic by Plato Part 3 Page 12

private man to lie to them in return is to be deemed a more heinous fault than for the patient or the pupil of a gymnasium not to speak the truth about his own bodily illnesses to the physician or to the trainer, or for a sailor not to tell the captain what is happening about the ship and the rest of the crew, and how things are going with himself or his fellow sailors.

Most true, he said.

If, then, the ruler catches anybody beside himself lying in the State,

‘Any of the craftsmen, whether he be priest or physician or carpenter,’

he will punish him for introducing a practice which is equally subversive and destructive of ship or State.

Most certainly, he said, if our idea of the State is ever carried out.