I've been rereading for the umpteenth time the Tao Te Ching. I don't know any text more worth rereading than this one.
The Tao that can be told is not the eternal Tao.
The name that can be named is not the eternal name.
The nameless is the beginning of heaven and earth.
The named is the mother of ten thousand things.
Ever desireless, one can see the mystery.
Ever desiring, one can see the manifestations.
These two spring from the same source but differ in name; this appears as darkness.
Darkness within darkness.
The gate to all mystery.
—Lao Tsu TAO TE CHING
translated by Gia-Fu Feng and Jane English