To be constant is to be useful. To be useful is to realize one's true nature. Realization of one's true nature is happiness. When one reaches happiness, one is close to perfection.

When there is no more separation between 'this' and 'that,' it is called the still-point of the Tao. At the still point in the center of the circle one can see the infinite in all things.

Great understanding is broad and unhurried; little understanding is cramped and busy

When he tries to extend his power over objects, those objects gain control of him. He who is controlled by objects loses possession of his inner self... Prisoners in the world of object, they have no choice but to submit to the demands of matter! They are pressed down and crushed by external forces: fashion, the market, events, public opinion. Never in a whole lifetime do they recover their right mind!... What a pity!

Paraphrased: When Chuang Tzu was about to die, his disciples began planning a splendid funeral. However some disciples expressed concern that given a particular arrangement, birds and kites would eat his remains. Chuang Tzu replied, "Well, above ground I shall be eaten by crows and kites, below it by ants and worms. What do you have against birds?

When you're dreaming, you don't know it's a dream. You might even interpret a dream in your dream - and then wake up and realize it was all a dream. Perhaps a great awakening will reveal this to be a dream as well.

That knowledge which stops at what it does not know, is the highest knowledge.