Therefore, if any has sinned in thought, that is, has desired to kill a man, or to commit fornication, or to steal, or to feast in secret and be drunken, or indeed to strike someone, or to desert, or to do anything else like this, and has been ready in his heart to carry out these sins; let him do penance for the greater in half a year, for the less in forty days on bread and water.’’
cf. Paen. Venniani 1-3