The optimism will bring happiness to. 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. 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, on the basis of reality is not a dreamy optimism high expectations are not realistic, real-life, if not to do so will make this a very disappointed and sad people.