Yung-chia Hsuan-Chueh (665-713 CE) was a Chinese scholar and monk, and is considered one of the greatest and most gifted teachers of Zen Buddhism. These verses are taken from his ‘Song of Enlightenment.’ ‘Prajna’, in the last verse, indicates the highest and purest form of wisdom.

You fail to recognize the priceless jewel
Living intimately within your heart.
It gives you everything;
The power to see, to hear, to think, to live.
It appears empty, yet it is not empty.

The jewel with no price can never be consumed.
It grows with use, becomes greater when consumed.
All wisdom is contained within it, all good, all virtue.
Immediately everything melts
When one enters that place beyond thought and words.

It speaks in silence,
The heart understands the silence.
The invisible way is open, there is no gate.
If someone asks, what is your philosophy, what is your understanding?
Reply, the pure prajna is beyond words.