“We meet ourselves time and again in a thousand disguises on the path of life.”

Section 8 : Suffering and Consolation
Founding Address (1876), Life and Destiny (1913)
Context: The condition of all progress is experience. We go wrong a thousand times before we find the right path. We struggle, and grope, and hurt ourselves until we learn the use of things, and this is true of things spiritual as well as of material things. Pain is unavoidable, but it acquires a new and higher meaning when we perceive that it is the price humanity must pay for an invaluable good.

Source: 1950s, Conquering Self-centeredness (1957)
Context: Life has its beginning and its maturity comes into being when an individual rises above self to something greater. Few individuals learn this, and so they go through life merely existing and never living. Now you see signs all along in your everyday life with individuals who are the victims of self-centeredness. They are the people who live an eternal “I.” They do not have the capacity to project the “I” into the “Thou." They do not have the mental equipment for an eternal, dangerous and sometimes costly altruism. They live a life of perpetual egotism. And they are the victims all around of the egocentric predicament. They start out, the minute you talk with them, talking about what they can do, what they have done. They’re the people who will tell you, before you talk with them five minutes, where they have been and who they know. They’re the people who can tell you in a few seconds, how many degrees they have and where they went to school and how much money they have. We meet these people every day. And so this is not a foreign subject. It is not something far off. It is a problem that meets us in everyday life. We meet it in ourselves, we meet in other selves: the problem of selfcenteredness.

Everything Is Illuminated (2002)

Source: Ulysses

Also quoted in "Stephen Hawking warns over making contact with aliens" http://news.bbc.co.uk/2/hi/uk_news/8642558.stm at BBC News (25 April 2010).
Into The Universe with Stephen Hawking (2010)
Context: If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans. … We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.

The Dragon Queen

"Mozart: An Overture" (1992), pp. 13-14
It All Adds Up (1994)
Context: There is no need to make an inventory of the times. It is demoralizing to describe ourselves to ourselves yet again. It is especially hard on us since we believe (as we have been educated to believe) that history has formed us and that we are all mini-summaries of the present age.