Nothing is true, Everything is permitted.

To say that nothing is true, is to realise that the foundations of society are fragile, and that we must be the shepherds of our own civilization. To say that everything is permitted. Is to understand that we are the architects of our actions, and that we must live with their consequences, whether glorious or tragic.

The dictum of the Order of the Assassins, as heard in Assassins Creed 1 and 2. First spoken by Altair’s master Al Mualim, “Nothing is True” exhibits the cynicism that the Assassins carry towards religion and fantasy, while “Everything is Permitted” represents their dedication the Order and the brutality of their work.

The Assassins in Ubisoft’s AC are based off of a real group active during the Crusades, called the Hashshashins, from which the word “Assassin” is derived.

Within the realm of philosopher, opposed to Assassins Creed, "Nothing is True. Everything is permitted." refers to the nature of reality and our perception of it. "Nothing is true" means that everything we sense and process in our minds is filtered reality, limited by our own bodies. We will never see reality objectively but just through the lens of our eyes, ears, etc. "Everything is permitted" branches off of this first statement; since nothing is true, the mind can generate its own reality. Hence, everything is permitted. This makes more sense in the context of drugs, particularly psychedelics, that enable the mind to perceive things that are very much disconnected from objective reality.