Happiness is within. It has nothing to do with how much applause you get or how many people praise you. Happiness comes when you believe that you have done something truly meaningful.
I take it that the good of mankind means the attainment by every man of all the happiness which he can enjoy without diminishing the happiness of his fellow men.
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Happiness always looks small while you hold it in your hands but let it go and you learn at once how big and precious it is.