Morally; by the leper is signified the sinner; for sin makes an unclean and impure soul; he falls down before Christ when he is confounded concerning his former sins; yet he ought to confess, and to seek the remedy of penitence; so the leper shews his disease, and asks a cure. The Lord stretches out His hand when He affords the aid of Divine mercy; whereupon follows immediately remission of sin; nor ought the Church to be reconciled to the same, but on the sentence of the Priest.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).