Summa Theologica by St. Thomas Aquinas
FP: Treatise On The Most Holy Trinity
Q[27] The Procession Of The Divine Persons
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Having considered what belongs to the unity of the divine essence, it remains to treat of what belongs to the Trinity of the persons in God. And because the divine Persons are distinguished from each other according to the relations of origin, the order of the doctrine leads us to consider firstly, the question of origin or procession; secondly, the relations of origin; thirdly, the persons.

Concerning procession there are five points of inquiry:

A[1] Whether there is procession in God?

A[2] Whether any procession in God can be called generation?

A[3] Whether there can be any other procession in God besides generation.

A[4] Whether that other procession can be called generation?

A[5] Whether there are more than two processions in God?