The energy of the mind is the essence of life.

The real essence of work is concentrated energy

The body is at its best between the ages of thirty and thirty-five; the mind is at its best about the age of forty-nine.

All paid jobs absorb and degrade the mind.

The Tao that can be told is not the eternal Tao.

It was weird and unexpected. You have the mind-set of swimming two days, and you usually save energy for next day.