The radical political, ethical and religious beliefs of Piotr of Goniądz gained him much popularity among the Protestant clergy and lesser gentry, though also created many conflicts, especially with the magnates. Piotr supported egalitarianism, pacifism and disregard for mundane life. The members of his community, often regarded as a sect within the Calvinist church, were forbidden to hold any public office, serve in the army or even carry arms. Piotr also strongly opposed serfdom, which led to constant conflicts even with his patron.