To know and not do, is to not yet know.

When people are educated, the distinction between classes disappears.

At 15 I set my heart on learning; At 30 I firmly took my stand; At 40 I had no delusions; At 50 I knew the Mandate of Heaven; At 60 my ear was attuned; At 70 I followed my heart's desire without overstepping the boundaries of right.

A ruthless man extends his ruthlessness from those he does not love to those he loves.

Some are born with knowledge, some derive it from study, and some acquire it only after a painful realization of their ignorance. But the knowledge being possessed, it comes to the same thing. Some study with a natural ease, some from a desire for advantages, and some by strenuous effort. But the achievement being made, it comes to the same thing.

Waste begets self-will; thrift begets meanness: but better be mean than self-willed.

If a man takes no thought about what is distant, he will find sorrow near at hand.