I had always imagined Rosa Parks as a stately woman with a bold temperament, someone who could easily stand up to a busload of glowering passengers. But when she died in 2005 at the age of ninety-two, the flood of obituaries recalled her as soft-spoken, sweet, and small in stature. They said she was "timid and shy" but had "the courage of a lion." They were full of phrases like "radical humility" and "quiet fortitude.

As a young boy, Charles Darwin made friends easily but preferred to spend his time taking long, solitary nature walks. (As an adult he was no different. “My dear Mr. Babbage,” he wrote to the famous mathematician who had invited him to a dinner party, “I am very much obliged to you for sending me cards for your parties, but I am afraid of accepting them, for I should meet some people there, to whom I have sworn by all the saints in Heaven, I never go out.”)

Flow is an optimal state in which you feel totally engaged in an activity...In a state of flow, you're neither bored nor anxious, and you don't question your own adequacy. Hours pass without your noticing.

Do you really believe in what you said or wrote – in the thing that’s bringing criticism? And if I do believe it, I can withstand anything.

College students who tend to study alone learn more over time than those who work in groups.

Solitude matters. And for some people it's the air they breathe.

you once said to would like to sit beside me while I write. Listen in that case I could not write at all. For writing means revealing one self to excess; that utmost of self-revelation and surrender, in which a human being, when involved with others, would feel he was losing himself, and from which, therefore, he will always shrink as long as he is in his right mind...That is why one can never be alone enough when one writes, why there can never be enough silence around one when one writes, why even night is not night enough.