“The catechism must be taught in the Church, on all accounts. It ought to be learned, definitively, although – or even because – we observe that in many a Western country the ability of memorizing texts is in decline. The catechism has to be preached, as it comprises the sound doctrine of the Church. Therefore,
You have heard the words, “You are what you eat.” I guess that could be applied to theology in the sense that you believe what you practice. Here is an article that illustrates this practicality.