The standard is not set up by the Catholic Church. She did not make the law and she cannot unmake it. And God does not ask the impossible. If a man takes the means he can live up to it, either practicing self-control, or accepting the children God sends. God offers sufficient help with every difficulty to the man of goodwill who meditates upon Christian truth and is earnest in prayer for the necessary grace.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty
