The more vigorously a ruler condemns folly in other men, the more should he cultivate his own understanding

The more vigorously a ruler condemns folly in other men, the more should he cultivate his own understanding. Isocrates. Antidosis. Speech 15. Section 72.

Image: Roman soldiers crossing a pontoon bridge on the Column of Marcus Aurelius by Wikimedia Commons contributor Matthias Kabel. Note: This bridge was used appropriately but the image and quote reminded me of the folly of Caligula's bridge to nowhere at Baiae.