The greatest inventions are those which most directly meet the wants of mankind.

成功不是幸福的关键。幸福是成功的关键。如果你热爱你所做的事情，你就会成功。

过去从未死去，它甚至还没有过去。

It is remarkable that a science which began with the consideration of games of chance should have become the most important object of human knowledge.