The feast of the Holy Trinity is coming up in two weeks, and right now I'm reading a short work by Rahner on it. He says something that's been repeated a lot: the doctrine of the Trinity doesn't really come alive for most of us. He said that if the Church were to change its teaching and say that there really is no Trinity, most of us wouldn't really have to change very much. We could go right on living and praying just the same.
But that's not a good situation. The Church wants the Trinity to be very real for us. Sometimes I just think of God, without necessarily thinking of the triune God. But God is a Trinity, and to think of him means to think of the Trinity.
Things like the sign of the cross are meant to help us remember the Trinity, but it needs to become living in our minds. It's hard because this teaching is so difficult to understand. We can never comprehend it. But like Frank Sheed used to say, whatever light we can get about the teaching is worth the effort. As I read more about this I'll blog more on it before the feast.