So the nature required to make a really noble Guardian of our commonwealth will be swift and strong, spirited, and philosophic.
From Plato’s Republic, III 376c (Ancient Philosophy 5th edition, Bard and Kaufmann, Cornford translation). I find this to be a nicely concise way of expressing a general rule-of-thumb I have for personal improvement or “ranking” individuals (if you should be so crude), namely that most human qualities fall into the physical, the psychosocial (everything from charisma to contentness to general sanity), and the intellectual; I generally try to push myself on all three of these fronts. Nice to hear agreement from the ancient past.
The Republic is also fairly amusing if you’ve read, oh, John Steakley’s Armor, or Margaret Weiss’s Star of the Guardians series.