Spiritual - Start reading the Summa Theologica by Saint Thomas Aquinas. He essentially sought to answer every single question that a person might have if they were to assume that Sacred Scripture is true, and he successfully does so without contradicting himself in any of its 4,000 pages. Coolest of all is that he did it during the Crusades when Christianity was under attack. There is no other book like it. If I had to make an analogy, it’s kind of like how the Federalist papers explain America. He explains Christianity.

I would also highly encourage anyone to read CS Lewis’ non-fiction books. He does a similar thing but is much less meticulous about answering every question with precise wording and format. Instead Lewis answers the biggest questions and does so in an easy to understand way.

Peter Kreeft is probably the greatest person currently living at doing what CS Lewis and Aquinas did. He’s another good one to check out.