Namely, reasoning well, expressing one’s self well, and acting well.

This is thus embodied by Lucretius:— Nam nihil e nihilo, in nihilum nîl posse reverti.

There is too remarkable a similarity in this to Campbell’s lines:— ’Tis distance lends enchantment to the view, And robes the mountains in their azure hue: to allow one to pass it over without pointing it out.

“Diogenes here appears (though, he gives no intimation of his doing so,) to be transcribing the reasonings of some one of the Sceptics.” French Transl.