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.
The man who is aware of himself is henceforward independent and he is never bored and life is only too short and he is steeped through and through with a profound yet temperate happiness.
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Although the skills aren't hard to learn finding the happiness and finding the satisfaction and finding fulfillment in continuously serving somebody else something good to eat is what makes a really good restaurant.