If you realise that you have enough, you are truly rich. If you stay in the centre and embrace death with your whole heart, you will endure forever.
To attain knowledge, add things every day. To attain wisdom, remove things every day.
Without leaving your home, you can know the whole world. Without looking through the window, you can see the ways of heaven. The further you go, the less you know. Thus the wise man knows without traveling, Sees without looking, Works without doing.