The Assassins believe in a strong set of values that strictly govern their code of conduct.

The Assassins are bound by a strict, unwavering set of values that govern every aspect of their conduct—this is the Creed, the heart of their order and the compass that guides their shadowy work.
 
At its core, the Creed is defined by three foundational principles that have stood for centuries:
 
  1. Do not kill innocents.
  2. Hide in plain sight and blend into the crowd.
  3. Never endanger the brotherhood.
 
Beyond these three rules, the Creed’s most famous maxim—“Nothing is true, everything is permitted”—has shaped the Assassins’ philosophy for generations. The words, spoken by ancestors before them, are etched into every Assassin’s soul. When Ezio Auditore joined the Brotherhood in Assassin’s Creed II, he spoke them aloud, cementing their place as the order’s eternal mantra:
 
  1. These are the words spoken by our ancestors that lie at the heart of our Creed.
  2. Where other men blindly follow the truth, remember—Nothing is true.
  3. When other men are limited by laws, remember—Everything is permitted.
  4. We work in the dark to serve the light. We are Assassins.
  5. Nothing is true, everything is permitted.
 
In Assassin’s Creed: Unity, Arno Dorian offers a profound, personal reflection on what this maxim truly means—one that redefines the Creed not as a license to act without consequence, but as a warning against blind fanaticism:
 
The Brotherhood’s dogma teaches us that all things are permitted, but I once misunderstood this as a call to pursue my ideals at any cost. I have since learned the truth: not everything is truly permitted. The Creed itself is a warning, a guardrail against the fanaticism that comes from clinging too tightly to doctrine. There is no higher right than our own judgment, no supreme master watching to punish us for our sins. At the end of the day, only we can guard against obsession. Only we can decide if the price of our cause is too high.
 
We so often see ourselves as the redeemers, the avengers, the saviors. We wage war on those who oppose us, only to be met with war in return. We dream of leaving our mark on the world… yet so many of us sacrifice our lives in vain, fighting wars that history will never record. What we have done, what we have built, what we have now—all of it will fade away with us.
 
This is the true weight of the Creed: it does not give us freedom from consequences, but the responsibility to choose wisely, even when the world tells us there are no rules.