What is this Beast, "Enlightenment?"

What is this experience that is so lionized as mokṣa, Eckhart's "birth of the son in the soul" (the geburt), nirvana, the "no self" and other evocations?  It is  "perfection." It is "absolute" and "eternal joy." It is the dawn of "the immovable."  With it "all suffering ends" and it is, in the immortal words [...]