>I don't know why I think If you have a strong reason for doing something then it is done automatically regardless of motivation. And this strong resolve can also help in formimg habits.

"Motivation" is just another way to say "reason."

>However, what you've stated is also true as motivation can get you off the couch and have you withstanding high amounts of difficulties.

Because that motivation is your reason to get your slobass off the couch, to stay awake late studying new material, to eat just the foods on your diet menu during the holidays. If your only reason to do something is weaker than what your brain can think of to not do it, then it's going to be tricky to stay doing it. It's your mind fighting your mind; how can you convince yourself that a short-term struggle with a longer-term benefit is better than a short-term gain with a long-term negative? That's the question you have to ask yourself in lots of situations as you go through life. The G. Michael Hopf quote is accurate on a macro and micro scale: "Hard times create strong men, strong men create good times, good times create weak men, and weak men create hard times.” In your interpersonal relationships and within just yourself, to struggle sometimes is good because it means you're pushing yourself to new expansions past your comfort zone which lead to new developments and a sense of accomplishment at what your were able to do when you hadn't been able to do that before.