Yar I read your paragraph .But this time you have given only two examples. Try to expand your ideas, such as

One should always be hopeful in his initiating of any good work, reform,
Etc. Once you start half the work is done. Optimists are pragmatic and rationale in their approach while pessimists are irrational.
Incorporate your paragraph with more examples such as the success of colonialists against imperialists, Winning of Afghans over Russians in 1980’s. The inventions and discoveries made by renowned scientists for the betterment of people’s lives.
And also compare optimism with pessimism .Pessimists are always hopeless and they always look at the gloomy consequences of their work and therefore always remain desperate.