Yes, but is it limited only by (or to) the size and complexity of the Universe ?
Yes, BUT -- nobody knows anything about the ultimate size and complexity of the Universe. Or of the human brain [mind] for that matter. So there is no standard by which to judge the limits, if any, of the human mind. Or of the Universe, if man is the standard.
I'd say that's a pretty hard limit right there. But then, the human mind, going back some seven millennia by now at least, has compensated for this state of ignorance by intuiting myths of the gods and the order they establish in the creations they make. This is how historical humanity has dealt with its innate problem of ignorance oner millennia of human experience.
Today we have a new myth to supplant the old. Namely, that Newton and Darwin have finally introduced the stable basis on which all reliable knowledge of the Universe ultimately rests. Human thought prior to the Enlightenment is merely the superstitious afflatus of knuckle-dragging primitives. Nothing to learn there.
And thus, arguably, our ancient forebears were wiser than we are today. For they acknowledged the sense of human limits, of human contingency and vulnerability. And this is a universally sensed phenomenon.
Well, FWIW UCANSEE2.