In this they did not imitate the considerate kindness of the Athenians, who, having captured Philip's letter-carriers when he was making war upon them, read all the other letters, indeed, but one of them, which was from Olympias, they would not open; instead, they sent it back to the king with its seal unbroken.
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1920. 9.
