I. King Darius greets Heraclitus of Ephesus, a wise man (p. 187)
Darius of Persia writes to convince Heraclitus to come to him and explain his teachings, since they seem to fly in the face of the common understanding but still bear the stamp of a reasoned position.  Not only does he make the request, but he offers what he suspects will be enticing benefits.

II. Heraclitus to King Darius, Son of father Hystaspes, greetings (p. 189)
Heraclitus replies:  “Nah.”

This is part of the Cynic Epistles Reading Plan.