It has always been my understanding the doctrine cannot evolve. Pope Pius X said
I entirely reject the heretical misrepresentation that dogmas evolve and change from one meaning to another different from the one which the Church held previously.
But in this article ewtn.com/library/DOCTRINE/RELLIB.TXT
the priest said
Since the council intends to evolve, it did not mean to
contradict. The Church has long evolved various teachings without
Can you help me understand. Thank you.