Picture taken from this site
Deus – God, Pater, Fillius, Spiritus Sanctus (or Sanctus Spiritus) – the Father, the Son, the Holy Spirit, est – is, non est – is not.
The concept of one God in three persons is extremely fascinating – regardless of the problem of its truthfullness. In the past many of the greatest European intellectuals tried to explain it.
It is closely related to the one of the most fundamental philosophical questions: what does it mean to be?
Illustration taken from this site