First Sentence

"Ramsey's philosophical and mathematical background was almost entirely shaped by the intellectual atmosphere of Cambridge during the 1920s, and by the writings of the great Cambridgians who surrounded him: Russell, whose Principia Mathematica he read quite early; Moore, whose essays he discussed and with whom he participated in the Moral Sciences Club; John Maynard Keynes, his mentor, whose Treatise on Probability he discussed as soon as it was published (1921); C.D. Broad, whose Scientific Thought had appeared in 1923; his friend Richard Braithwaite, but also logicians such as W.E. Johnson and philosophers such as C.K. Ogden."