Don't memorize lines !

Silman who is a great coach, wrote a very interresting article (http://www.chesscafe.com/yaz/yaz102.htm)about the life of a theorical noveltie.I want also to underline one of his sentence:

"When masters sit down to study openings, they do much more than simply memorize moves. They strive to understand the ideas behind them. They plow through typical endings the openings give  rise to them.

This is the key to good opening :Don't memorize lines ,Understand ideas!