In 1668, Penn wrote his first pamphlet, which harshly criticized Catholics, Anglicans, and other Protestant dissenters, for their dependence on outward ceremonial observances and rote memorization of confessions, rather than emphasizing the seeking of God in your own heart.
It was titled: "Truth Exalted; in a short, but sure, testimony against all those religions, faiths, and worships that have been formed and followed in the darkness of apostasy. — And for that glorious light which is now risen, and shines forth in the life and doctrine of the despised Quakers, as the alone good old way of life and salvation.
--Presented to princes, priests and people, that they may repent, believe and obey. By William Penn, whom divine love constrains in a holy contempt to trample on Egypt's glory, not fearing the Kings wrath, having beheld the Majesty of him who is invisible."