A habit is the intersection of knowledge, skill and desire. In order to make something a habit in our lives, we have to have all three.
I may be ineffective in my interactions with my work associates, my spouse, or my children because I constantly tell them what I think, but I never really listen to them. Unless I search out correct principles of human interaction, I may not even know I need to listen.
Even if I do know that in order to interact effectively with others I really need to listen to them, I may not have the skill. I may not know how to really deeply listen to another human being.
But knowing I need to listen and knowing how to listen is not enough. Unless I want to listen, unless I have the desire, it won't be a habit in my life. Creating a habit requires work in all three dimensions.