What about sanctification prior to Baptism?

We’re glad that you liked the article. Sanctification from sin is not possible without water baptism. You may be referring to the position of the St. Benedict Center, which holds that sanctification is possible without water baptism but that salvation is not possible without water baptism. There is a section refuting this position in the book. To sum up the problems with their position simply: they correctly hold that unbaptized catechumens are outside the Catholic Church, but at the same time they hold that these catechumens (whom they admit are outside the Church) can have their sins remitted. This contradicts the solemn teaching of Pope Boniface VIII, which teaches that there is no remission of sins outside the Church.

Pope Boniface VIII, Unam Sanctam, Nov. 18, 1302, ex cathedra: “With Faith urging us we are forced to believe and to hold the one, holy, Catholic Church and that, apostolic, and we firmly believe and simply confess this Church outside of which there is no salvation nor remission of sin.” (Denz. 468-469)