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Good works are the seals and proofs of faith; for even as a letter must have a seal to strengthen the same, even so faith must have good works.

Martin Luther (1818). “The familiar discourses of dr. Martin Luther, tr. by H. Bell”, p.160
Good works are the seals and proofs of faith; for even as a letter must have a seal to strengthen the same, even so faith must have good works.