The optimism will bring happiness to us. On the basis of fact, not a dreamer. 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. Optimism is not realistic. If real life is not like it will make this a very disappointed and anxious.
optimism will be brought happiness to us. On the basis of reality is not a dreamy optimism, which is not true if real-life is not a man to do so will make this a very disappointed and very sad.