I agree with this. Motivation is the why you might want to do something, and discipline is part of the how you get that something done. Clinical depression, a

I agree with this. Motivation is the why you might want to do something, and discipline is part of the how you get that something done. Clinical depression, a not uncommon issue, is characterized by having no motivation to do anything, and discipline won't help much in that situation. Also, one's state of mind can be managed by discipline if one is motivated to do so - for example, I have a ~20-min routine to get into the proper frame of mind for writing or coding, which basically is a bit of cleaning up the workspace, a bit of breathing exercises, a bit of physical exercise, quick shower/brush teeth/etc if needed, then I can work for a few hours in a focused positive state of mind. Discipline means initiating that whole process on a regular schedule.