What is, is not; and what is not, yet is

Till you have grasped this truth, you might as well
Waste no more time on fool philosophies:
But once you've grasped what these my teachings tell,
That anything is all things, that the one
Is every and the same, then where's the call
To fret for deeper knowledge? There is none
More deep than all-is-one and one-is-all.

The believing mind knows no duality
And what is dual denies the believing mind
Which, though I word you, inexpressibly
Extends beyond all language to allow
One truth in contradictions. You will find
It has no past, no future and no now.