In Taoism there is a famous saying that is translated somewhat as follows,

Jing transforms into chi,
Chi transforms into shen,
Shen transforms into emptiness,
Break the emptiness to return to the Tao.

It should really be more properly translated along the following lines:

When jing transforms, your chi arises (comes out),
When your chi transforms, no-thought (illumination, spirit, prajna wisdom, spiritual knowing, etc.) arises,
As illumination clarifies, you can realize emptiness,
If you don’t hold on to the emptiness realization then it will deepen and eventually you’ll attain the Tao.

Related posts:

1. What’s It Like, What Does It Mean to “See the Tao”?
2. Sexual Desire and Meditation
3. How does one become enlightened?
4. The Samadhi of Ucchushma