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One note is that the Church has always condemned abortion (and artificial contraception), from the beginning of the Church. See the Didache around the year 100. St. Thomas' idea of delayed ensoulment is, even in his view, a theologian's speculation on the subject, and does not weaken the Church's teaching, which is based on the revelation of God and the interpretation of the Church's Magisterium, but is an attempt to understand it better.