Men always did and always will err, and in nothing more than in what they consider right and wrong.
The substance of the claim to infallibility made by the Roman Catholic Church is that the Church and the pope cannot err when solemnly enunciating, as binding on all the faithful, a decision on a question of faith or morals.
RR': C(NO) NO 2 - ERR': C(NH OH) 2 - > RR': C: N 0H+NH20H.
In the third, the materials are worked up after the model or pattern of nature, though we are prone to err in the progress from sense to reason; the result is philosophy, which is concerned either with God, with nature or with man, the second being the most important.
The medieval mind was only too prone to look on morality as a highly technical art, quite as difficult as medicine or chancery law - a path where wayfaring men were certain to err, with no guide but their unsophisticated conscience.