The capacity for loneliness is like a muscle that must be exercised.

The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.

One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half.

Do not be avaricious； do not be a recluse.

I don't compete with others. I compete with myself.

Without justice, courage is weak.