The most important quote in this book (for me) was a brief mention of an old player Daniel used to know. That said, Negreanu makes some great points about appearing weak and allowing your opponent to lead (even though that will no longer work for him). However, you should always stick to your style while also switching gears and playing the opposite of the table (tight in a loose game, loose in a tight game).
Every person is different therefore, everyone's approach to the game is going to be different. It's going to be the most informative, helpful, and profitable toward your sessions.