He that oppresses the poor blasphemes his Maker
–Proverbs of Solomon 14:31
But he that shall blaspheme against the Holy Ghost shall never have forgiveness
–Jesus, Mark 3:29
That active scandal is a mortal sin Christ Himself has taught and reason makes evident. If charity obliges us to assist our neighbor’s temporal and spiritual necessities it obliges us still more strongly not to be to him a cause of sin or spiritual ruin. Hence it follows that every sin of scandal is contrary to charity.
–Entry: Public Scandal, Catholic Encyclopedia, 1908