We often use the analogy of the sun when teaching about the Blessed Trinity. Just as the sun is one object consisting of three parts (the sun, the light, and the heat), so too is God one Being who consists of three Persons (the Father, the Son, and the Holy Spirit). Of course, this is just an imperfect analogy, since God is infinitely greater than anything we can imagine! The word "Trinity" simply means "three-in-one." And while that might sound like a contradiction, it's actually a perfect way to describe our all-powerful, all-knowing God. After all, only He could be both Three and One at the same time!