In our circle we have a saying, poker is a game of skill, luck and mindset. The skill is the math, the psychology, the strategic work. The luck well that speaks for itself. And the mindset, which is the beliefs one has in their game and abilities. Its the attitude you bring to the table and the way you handle the ups and the downs. This is what makes the difference between a very good player and a great. How much of each of these make up the game is debatable and I tend to think it varies person to person based on where they are in their competency.