色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

The present is the past rolled up for action, and the past is the present unrolled for understanding.

All men have the stars, but they are not the same things for different people. For some, who are travelers, the stars are guides. For others they are no more than little lights in the sky. For others, who are scholars, they are problems. For my businessman they were wealth.

The hardest thing in life is to know which bridge to cross and which to burn.

Social progress requires the organic combination of individual freedom and social responsibility.

最好的預測不是來自復雜模型，而是來自對基本激勵的理解。