Summa Theologiae by St. Thomas Aquinas
TP: Treatise On The Sacraments
Q[65] Of The Number Of The Sacraments
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Prologue   A[1]   A[2]   A[3]   A[4]  

We have now to consider the number of the sacraments: and concerning this there are four points of inquiry:

A[1] Whether there are seven sacraments?

A[2] The order of the sacraments among themselves;

A[3] Their mutual comparison;

A[4] Whether all the sacraments are necessary for salvation?