The Fathers of the Church used examples to explain the Trinity. They said: Look at a tree if you want to try to understand God. There is the root, the trunk and the fruit. The root is like God the Father, invisible but you know it's there, the trunk is like God the son, sent forth by the Father, visible and tangible, the branches and fruit is like the Holy Spirit. We are connected to Christ through the Spirit dwelling in us and by the power of the Spirit we bear fruit in the world.

Or look at a steam: the water rises from a source, but usually that source is hidden, the source of the stream is like God the Father, the stream which we can see and touch is like God the Son, visible because it flows from the one who sends Him, but the water as it flows into the fields, irrigating the plants and giving them life, allowing them to bring forth a harvest is like the Holy Spirit.

Or look at the light. The light comes from the sun, the source of light, but we see the light most clearly when it pierces through the clouds as a sunbeam. When we are sitting in a room and the light shines in and touches us, we are warmed and can feel the light. So, the sun is like the Father, the beam like the Son and the warmth like the Holy Spirit.

What each of these illustrations has in common is that they are all analogies, God isn't the tree or the stream or the light but like them. All our language about God can only hint at the reality never grasp or contain God in one image.