Forgive me for my unexpressive and wrongful language, my intentions are pure and I'm not trying to manipulate you into anything. Please, be respectuful of others opinions and if you want to comment, express your thoughts in a polite manner.
Vilppu dedicated his life to his teachings, but people often overlook the most important teaching of all:
"Those are not rules, just tools!"
He keeps repeating it over and over again in his book and courses, but many people overlook this very important piece of advice.
You see, when you visualize every piece of knowledge as a part of a tool, and tools parts of drawing, the question of motivation goes away. You are not trying anymore to learn everything that there is to drawing, but you are just adding or improving tools that you already have, you become more goal oriented and driven to achieve the goal you want. If your current drawings don't look like how you want them, just improve the tools and try to achieve your drawing goal again.
I believe sculpting is the best analogy, you use your tools to remove the superflous marble, if the tools don't do what you want, you change them to better achieve your goal.
Again, forgive me for any grammar mistakes. I know that justifications don't solve anything, but I respect the language of others and it saddens me to make so many grammatical mistakes.