There is a course in some semester in our life called the Knowledge Course. This covers what we are made of, the principles of our existence, the composition of the cosmos, our relationship to it, and how it all came into being.
The course has theory credits and lab credits. The theory covers the principles while the lab encourages experimentation and practices that establish the theory. The theory is available in books and talks. The lab happens to be our own body and mind.
There are some people who study only the theory. They do not test the theory in practice. They are Philosophers.
The are some people who only do the practices, just for the credits, without wondering what are the theorems that they are testing out. They are the Religious people.
There are some who address both - learn the theory, ask questions and try to validate the same through practical living. They are Spiritual Seekers.