Empty yourself of everything:
Let your mind be at peace.
While ten thousand things rise and fall
the Self contemplates their return.
Each of them grows and flourishes and
then returns to the source.
To return to the source is stillness,
which is to fulfill the way of nature.
The way of nature is constant.
Knowing constancy is insight.
~ Lao Tsu, Tao Te Ching (4th century BCE)