Auctoritas siquidem ex vera ratione processit, ratio vero nequaquam ex auctoritate. Omnis enim auctoritas, quae vera ratione non approbatur, infirma … - Johannes Scotus Eriugena

Quid est aliud de philosophia tractare, nisi verae religionis, qua summa et principalis omnium rerum causa, Deus, et humiliter colitur, et rationabiliter investigatur, regulas exponere? Conficitur inde, veram esse philosophiam veram religionem, conversimque veram religionem esse veram philosophiam.

What, then, is it to treat of philosophy, unless to lay down the rules of the true religion by which we seek rationally and adore humbly God, who is the first and sovereign cause of all things? Hence it follows that the true philosophy is the true religion, and reciprocally that the true religion is the true philosophy.

One man stands head and shoulders above his contemporary scholars: head and shoulders, some hold, above the Middle Ages: John Scotus Erigena.