We cannot tell the precise moment when friendship is formed. As in filling a vessel drop by drop, there is at last a drop which makes it run over; so in a series of kindnesses there is at last one which makes the heart run over.
James Boswell. The Life of Samuel Johnson (1791)
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“I think that I had better go, Holmes.”
“Not a bit, Doctor. Stay where you are. I am lost without my Boswell. And this promises to be interesting. It would be a pity to miss it.”
Arthur Conan Doyle. The Adventures of Sherlock Holmes. A Scandal in Bohemia
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Blackadder: [...] James Boswell is the only real woman writing at the moment, and that's just because she wants to get inside Johnson's britches.