The Discipline Arcani

The Adepts cannot reveal themselves to the public at large. In the ancient world and into medieval times people didn't believe they knew everything, they accepted the existence of things they didn't understand. Those days are gone. 
Whenever Adepts, or any Supernaturals, have attempted to reveal the existence of the paranormal to modern peoples, disaster has ensued. The Burning Times, the Spanish Inquisition, the Peasant's Revolt during the Protestant Reformation... Too many people just cant accept the existence of Supernaturals today. 
The art of keeping themselves secret is called the Discipline Arcani (literally, the 'discipline of the secret'). Adepts who flaunt the Discipline or who reveal the existence of the Supernaturals to Uninitiated people without permission will soon find themselves being tracked by both the IAS and the Cessationist Chapter.