Don't imagine that you'll discover {the truth} by accumulating more knowledge. Knowledge creates doubt, and doubt makes you ravenous for more knowledge. You can't get full eating this way.
If a great country yields to a small country, it will conquer the small country. If a small country yields to a great country, it will be conquered by the great country.
Thirty spokes meet in the hub,
but the empty space between them
is the essence of the wheel.
Pots are formed from clay,
but the empty space within it
is the essence of the pot.
Walls with windows and doors
form the house,
but the empty space within it
is the essence of the home.
Do nondoing, strive for non-stiving, savor the flavourless, make much of little, repay enmity with virture; plan for difficulty when it is still easy, do the great while it is still small.