US-P16.016ab ।US-P16.016cd ॥
In plain words
That unconditioned reality truly exists, standing prior to all mental projections, for it is the very ground and origin from which all mental constructs arise.
Close to the Sanskrit
That non-dual (reality) indeed exists, which is prior to mental construction; because it is the cause of the origin of mental construction, and since it is indeed the cause of this.