I have quoted a snippet from Hakuin's Song of the Zazen.
Loosely translated :
Your singing-and-dancing is no other than the voice of the Dharma. How boundless is the sky of Samadhi!
I reference this tidbit often, but the author here explains this song, this poetry far better than I ... (snipped) :
Dharma – Can be translated as the Way, the Path, the Law, Righteousness. We might think of it as the directional flow of universal consciousness and how we, through our focus and actions, enter into that flow.
Samadhi – The blissful union of the individual awareness with the Eternal, often considered the mark of enlightenment.
This is a beautiful sacred piece of poetry and well worth reading if you might have the chance!