Creating habit is an interaction of knowledge,  skills and desire.

Knowledge is the theoretical paradigm that tell you what to do and the reasoning why.

Skills is the how to do.

Desire is the motivation to do it that's make you want to do.

If we apply the 3 concepts on reading,  we will understand completely the important of reading and continuously creating the habits

Source : The 7 habits of Highly Effective People Pg 55