The inner world of thoughts and perception is more powerful than the outer world of materiality. Instead of focusing on changing the status of our material surroundings, we should instead change our perception of our material surroundings. Yoga requires that we examine our thoughts and judgements. The one thing that all people in the world seem to want is happiness. Yoga shows us that such happiness can only come from peace of mind.
Peace of mind can only arise by the cessation of thoughts.
The moments we feel most peaceful occur between thoughts, when our minds are pure and empty. When this happens, we have peace of mind, we have a glimpse of enlightenment, and we have happiness. The physical aspect of Yoga was developed in order to focus the mind is a single direction. While practicing Yoga, the mind and the body work together, and when they unite in perfect harmony, there is no thought or ego, there is no judgement or attachment. There is only peace of mind and a piece of happiness.