The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.

如果你想有所发现，去寻找那些既显而易见又不可见的事物。

I don't think anything is unrealistic if you believe you can do it.