Counting out the Trinity:
1 God
2 Essential Predications: One in being, three in mode of being (Father, Son, & Spirit).
3 Properties: Paternity (Father), filiation (Son), & procession (Spirit).
4 Relations: Paternity (Father begets Son), filiation (Son begotten of the Father), active spiration (Father & Son breathe the Spirit), and Passive spiration (Spirit proceeds from Father & Son).
5 Notions: Unbegottenness & paternity (Father), filiation (Son), active spiration (Father & Son breathe the Spirit), and passive spiration (Spirit proceeds from Father & Son).