“Dad, I wonder if energy is the most important virtue for success.”
“No. It’s attitude. All attitude. Without the proper attitude you can’t be motivated.”
School has started and I have a multitude of things to focus on. I hope I can stay consistent with my motivation throughout the semester.
Joseph Kelly's Blog 
Are you referring to the Von Clausewitz quote? Attitude is a given, and what he means is that more than strategy or brilliance or numerical superiority, relentless pursuit has contributed more to victory than anything else.