The optimism will bring happiness to us. On the basis of reality, not idealism, high expectations are optimistic and unrealistic. If real life is not like that. This will make people more frustrated and unhappy.
The optimism will bring happiness to ourselves. On the basis of reality, not whimsical. High expectations, optimism is not realistic. If real life is not like it will make this a very disappointed and anxious.
Look at the world in terms of good will bring happiness to us. On the basis of reality is not a dreamy optimism high expectations, which is not true if real life is not to do so will make this man a very disappointed and very sad.