Aratus (19.3-20.1)

For who will not admire the magnanimity of the man, and yearn even now to lend a helping hand, who purchased at so high a price so great a danger, and pledged what he thought the most precious of his possessions in order that he might be introduced by night among his enemies and contend for his life, receiving as his security from his countrymen the hope of a noble action, and nothing else?

Now the enterprise was dangerous in itself, but was made more dangerous still by a mistake which occurred at the very beginning through ignorance. For Technon, the servant of Aratus, had been sent to inspect the wall with Diodes, and had not yet met Diodes face to face, but thought he would know how he looked because Erginus had described him as curly-haired, of a swarthy complexion, and without a beard.