Learn to forget. The first time you hear this sentence you are knocked off your feet, but when presented with the concept of learning to forget you can start to appreciate it.
First you learn, then you understand, then you understand why you understand, then you forget - so learn to forget.
This is the Asian logic as it was presented to me.
In west it has recently been in the spotlight, thanks to the promotion by the pragmatic programmers, and is known as The Dreyfus Model of Skills Acquisition.
Tomato or Tomato. It is worth checking out.