Human mindset is such that, even if we try to be cool and calm, anger comes if things do not get like our way. But again and again if we try to be not mad, things will happen like we have thought off.
Not only in forex but in general too, mindset plays a very important role. It is your mindset which makes or break you. So be optimistic and positive always.
Motivation is a self belief from within i guess. It differs from person to person. Person's motivation can be anything. Completing the set target is also a motivation.