This allows for cross-referencing, and ultimately, a deeper understanding. Whatever you learn, make sure you don't forget. The insight is fleeting if you don't capture it in some way. It has to sink into your bones and permeate your mind. This means constant review of one's learning in some form or another.
Verbal repetition is powerful.
It clarifies an idea and brings it into reality. That's why we repeat the Shema twice a day, and why we review the Torah year after year. Whatever moves you and gets you energized, repeat it again, again and again. Make it your refrain, your background music. When you wear out one phrase, get yourself another.