Quote
Beauty is truth, truth beauty,—that is all ye know on earth, and all ye need to know.
Note
These famous lines conclude Keats's meditation on an ancient urn. The equation of beauty and truth suggests they are inseparable—what is beautiful is true, and vice versa. This can be read as an internal standard: the perception of beauty reveals truth directly, without need for further explanation or proof. The phrase "all ye need to know" implies sufficiency: perhaps the deepest knowledge is aesthetic and experiential, not purely intellectual.