Most of the things worth your time to understand are so complex you need to memorize and internalize multitudes of other concepts first before you can even hope

Most of the things worth your time to understand are so complex you need to memorize and internalize multitudes of other concepts first before you can even hope to understand what you're learning. I truly mean internalize. For example relativity. You cannot understand relativity just by following the logic from first principles all the way to enlightenment. You need to not only understand the earlier principles, you actually need to practice and internalize the earlier principles using techniques of memorization. Newtons laws of motion and vectors must become second nature to you through repeated practice and memorization before you can move forward. Simply understanding one concept is not enough to move on to the next concept.