It is not opinion, or speculation, or notions of what is true, or assent to or the subscription of articles or propositions, though never so soundly worded, that … makes a man a true believer or a true Christian. But it is a conformity of mind and practice to the will of God, in all holiness of conversation, according to the dictates of this Divine principle of Light and Life in the soul which denotes a person truly a child of God.

William Penn, 1692