The essence of a room is the space within it. If it's completely filled with stuff, it has no more room, therefore cannot be called a room any more and in effect loses it's entire purpose and meaning. The same goes for your mind. The more stuff you pack it with, the less room you have for your essence/soul to evolve.
Empty space is opportunity. I'm not saying to forget everything you know or to stop learning, I'm simply advising the practice of expansion. The more space you have in your glass, the more opportunity you have to fill it with greatness.
If it's full, get a bigger glass.
With Love and Water, Alissa