If one is guided by profit in one's actions, one will incur much ill will.
Those who cannot forgive others break the bridge over which they themselves must pass.
To know it is not as good as to love it, and to love it is not as good as to take delight in it.
When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps.
The Essence of Knowledge is, having it, to use it.
Better a diamond with a flaw than a pebble without.