In the world of knowledge, the essential Form of Good is the limit of our inquiries, and can barely be perceived; but, when perceived, we cannot help concluding that it is in every case the source of all that is bright and beautiful --in the visible world giving birth to light and its master, and in the intellectual world dispensing, immediately and with full authority, truth and reason --and that whosoever would act wisely, either in private or in public, must set this Form of Good before his eyes.

Plato