For development (true learning) one of the major prerequisites are openness, flexibility and being able to change beliefs if you learn something new that is closer to truth than your current belief structure. All that takes courage and energy. It is painful to be really aware that you don't know and never will. Opening yourself to new ideas is frightening because if you find out something new that contradicts your current paradigm you can never go back. Yes, you can bullshit yourself and reject it but even then it will be a worm that is eating you up inside. It is painful to have your ideas/beliefs/views challenged and changed. It truly hurts sometimes if you learn something new. Especially if it's some unpleasant reality. Almost all true learning comes with pain as you have to give up previously held, and sometimes really comforting, ideas. When one is learning he is like a child - open to new input/experience and willing to try it out. It hurts when child is failing while trying to learn how to walk. It hurts when one is exercising in order to have bigger/stronger muscles. It hurts when you are training tennis and is very frightening to go on a tournament after all that time spent learning tennis. One knows that it is a real possibility that he will lose a match and find out that he has much more to learn. So true learning really is a painful process accompanied with constant uncertainty rather than (false sense of) security. It is a beautiful process just like forming of Havaii islands. Constantly changing ones inner territory by allowing new views to break through the thick crust of previous beliefs/views. But one needs to be comfortable with real pressure and look at the new knowledge when it brakes the crust. That way ones senses can get access to really fertile new grounds and information that is much more pure, so one can flourish. At the same time there is true uncomfortability that accompanies uncertainty, tremors and pressure of the new eruption and fresh information/knowledge flow that it brings. Burning ones old belief structure is a true possibility and it doesn't come pain free. Enough with volcano metafor.

Add to all that the energy needed for learning and it is pretty obvious why people generally prefer to hold old rigid beliefs and are not interested in learning. Sorry for the way I wrote it, I am under the influence of Etna volcano eruption and one that is building up in Iceland.
I see learning in this way: