The Three Treasures of Chi Gong – Jing, Qi, Shen

 The three treasures are like a candle, an analogy:

“Jing is like the wax and wick, which are the substantial parts of the candle. They are made of material, which is essentially condensed energy (physical body).

The flame of the lit candle is likened to Qi, for this is the energetic activity of the candle, which eventually results in the burning out of the candle.

The radiance given off by the flaming candle is Shen.

The larger the candle and the better the quality of the wax and wick (jing), the steadier will be its flame (qi) and the longer the candle will last.

The steadier the flame, the steadier the light given off and the greater the flame, the greater the light.”

I don't remember where i found this but i like the analogy. If it's yours, let me know.