When we read most things our normal reaction is: I have read this, I know this, nothing new here.
While it may be true that you have read that stuff or know about it, the important question you have to ask is do you practice what you know?
The reality is that you really know something only when you live it! Knowledge creates a shift in your understanding and changes the way you live. Otherwise its just information.
Some of the most supposedly simple concepts such as having heightened awareness, living in the present moment or practicing detachment are actually very hard to practice.
So while you may know about these concepts, unless you live these concepts, you still don’t really know them!