True piety is acting what one knows.
Matthew Arnold
Piety and morality are but the same spirit differently manifested. Piety is religion with its face toward God; morality is religion with its face toward the world.
Tryon Edwards
Paul does not forbid you to use rites and ceremonies, but it is not his wish that he who is free in Christ should be bound by them. He does not condemn the law of works if only one uses it lawfully. Without these things perhaps you will not be pious; but they do not make you pious.
Desiderius Erasmus
Multitudes are substituting zeal for piety, liberality for mortification, and a social for a personal religion.
John Angell James
Earth has nothing more tender than a woman’s heart when it is the abode of piety.
Martin Luther