Self-control separates us from our ancestors and from the rest of the animal kingdom due to our stubbornness. It is about out ability of managing our impulses in order to reach goals for longer-term action. Instead of inmediately respond to impulses, we can planify, evaluate alternative actions and frequently, avoid doing things about we may regret later.
DETERMINATION IS WHAT MAKE LITTLE THINGS WORTH
The ability of exercise self-control is often referred as will of strength. Is what allows us to focus and underlies every successes. There is a meaningful controversy in science about whether or not willpower is a finite resource. The studies have proven that willpower exercise takes a lot of mental energy, specially glucosa stores, which decreases ego. This is one of the reasons why we are more determined to reach that chocolate cookie when we feel stressed than when we feel on the top of the world.