What limits our knowledge of the universe? This chapter explores permanent boundaries built into reality itself: the cosmic horizon, the opacity of the early universe, quantum uncertainty, the unpredictability of complex systems, the mystery of consciousness, and Gödel's incompleteness theorem. Knowledge has edges—and living well means standing at them honestly, without denial or despair.

What limits knowledge? This SE Press paper maps the sensory, logical, quantum, and cosmological frontiers of what can be known. The Gradient Reality Model (GRM) and SGF show every answer is star-scored, upgradable, and audit-traceable—perfect knowledge is always just beyond the next horizon.