Does contraception prevent souls from existing which God intended to be born?

The Catholic Answers

People who practice contraception certainly prevent souls from coming into existence. Did God ordain them to be born? Certainly not by His absolute will, or He would not permit people to succeed in their crime. But He does ordain them to be born conditionally, that is, provided the parents do the right thing He intended them to do. If they fulfill the conditions required for the generation of children, He intends children to result. At the same time, whilst commanding parents to observe the law of nature, He leaves them physically free to serve Him or to rebel, as in the case of any other commandments. Those who practice contraception violate God’s law, and deprive Christ of children to redeem. And if they die in such sin they will most certainly be lost If they say that conscience does not reproach them, then they have warped their conscience, and will have to answer for it.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty