On Pentecost Sunday, as our priest was delivering his sermon, he gave the most interesting analogy of the Holy Spirit. It's one I have never heard before, but will certainly remember for when I teach catechism again. It would also come in handy for helping others to understand how there are three Persons in one God. Here it is:
Water comes in different forms. There is ice, vapour, and liquid water. They are all the same thing - water - even though they take different forms.
Interesting, isn't it? It just might help someone to grasp that difficult concept.