Summa Theologica by St. Thomas Aquinas
FP: Treatise On The Most Holy Trinity
Q[31] Of What Belongs To The Unity Or Plurality In God
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Prologue   A[1]   A[2]   A[3]   A[4]  

We now consider what belongs to the unity or plurality in God; which gives rise to four points of inquiry:

A[1] Concerning the word "Trinity";

A[2] Whether we can say that the Son is other than the Father?

A[3] Whether an exclusive term, which seems to exclude otherness, can be joined to an essential name in God?

A[4] Whether it can be joined to a personal term?