Heard this term a few weeks ago. Been thinking about it ever since. When teaching Freshman Chemistry, I repeatedly lectured: Freshman Chem is an overview of everything you will ever need to know in Chemistry. Learn it now. Know it later. It all repeats. It's all math. Pure and simple.
Now teaching Confirmation I, I find myself with a similar in size retort, but so much more important. It's all about Honoring God. In everything you do.
For two years that is the soul (intentional spelling mistake) subject matter.