to perceive the good, therefore, is to perceive reality.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“It is by means of the good that dialectic is able to dispense with the hypotheses of the mathematician. The underlying assumption is that reality, as opposed to appearance, is completely and perfectly good; to perceive the good, therefore, is to perceive reality. Throughout Plato’s philosophy there is the same fusion of intellect and mysticism as in Pythagoreanism, but at this final culmination mysticism clearly has the upper hand. Plato’s doctrine of ideas contains a number of obvious errors.” source