Our revels now are ended. These our actors,
As I foretold you, were all spirits and
Are melted into air, into thin air;
And, like the baseless fabric of this vision,
The cloud-capp’d towers, the gorgeous palaces,
The solemn temples, the great globe itself,
Yea, all which it inherit, shall dissolve,
And, like this insubstantial pageant faded,
Leave not a rack behind. We are such stuff
As dreams are made on: and our little life
Is rounded with a sleep.
– The Tempest (Prospero, Act 4 Scene 1)
This extract from TEMPEST does not explain fully whether Shakespeare was a mystic or a mere artist!
Art is human artifice. But mysticism is experience of the real thing far beyond mere human artifices.
If Shakespeare knew that then there was only one way he could know it – he’d had the mystic experience of Reality! Ergo, he became a mystic.
All best wishes.