“Keeping a book on macroeconomics up to date is a challenging and neverending task. The field is continually evolving, as new events and research lead to doubts about old views and the emergence of new ideas, models, and tests. The result is that each edition of this book is very different from the one before. This is truer of this revision than any previous one.”

Advanced macroeconomics 4th ed. (2011), "Preface to the Fourth Edition"

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David Romer1

American economist 1958

D. D. Raphael (1916–2015) Philosopher

The Impartial Spectator: Adam Smith's Moral Philosophy (2007), Ch. 1: Two Versions

“Science books go out of date. We throw the old one away when a newer one comes out, when we have new theories. But we don't throw away our old data; we merely interpret them differently. New theories try to account for old data (and new data) in new ways.”

Guy Consolmagno (1952) American Jesuit, Catholic Priest, research astronomer and planetary scientist at the Vatican Observatory.

[Consolmagno, Guy, Mueller, Paul, https://www.google.com/books?id=lf5vDwAAQBAJ&pg=PA16, 9780804136952, Would You Baptize an Extraterrestrial?: And Other Questions from the Astronomers' In-Box at the Vatican Observatory, 16, 2014, Image]

“Very broadly, I think one writes and rewrites the same book. I lead a character from book to book, I continue along with the same ideas. Only the angle of vision, the method, the lighting, change.”

Françoise Sagan (1935–2004) French writer

Paris Review interview (1956)

“The great inconvenience of new books is that they prevent us from reading the old ones.”

Joseph Joubert (1754–1824) French moralist and essayist

“Each new ontological theory, propounded in lieu of previous ones shown to be untenable, has been followed by a new criticism leading to a new scepticism. All possible conceptions have been one by one tried and found wanting; and so the entire field of speculation has been gradually exhausted without positive result: the only result reached being the negative one above stated, that the reality existing behind all appearances is, and must ever be, unknown.”

Herbert Spencer (1820–1903) English philosopher, biologist, sociologist, and prominent classical liberal political theorist

Pt. I, The Unknowable; Ch. IV, The Relativity of All Knowledge
First Principles (1862)

“One thing has always been true: That book or that person who can give me an idea or a new slant on an old idea is my friend.”

Louis L'Amour (1908–1988) Novelist, short story writer

Source: Education of a Wandering Man (1989), Ch. 1
Context: A great book begins with an idea; a great life, with a determination.
My life may not be great to others, but to me it has been one of steady progression, never dull, often exciting, often hungry, tired, and lonely, but always learning. Somewhere back down the years I decided, or my nature decided for me, that I would be a teller of stories.
Decisions had to be made and there was nobody but me to make them. My course altered a number of times but never deviated from the destination I had decided upon. Whether this was altogether a matter of choice I do not know. Perhaps my early reading and the storytelling at home had preconditioned me for the role I adopted.
Somewhere along the line I had fallen in love with learning, and it became a lifelong romance. Early on I discovered it was fun to follow along the byways of history to find those treasures that await any searcher. It may be that all later decisions followed naturally from that first one.
One thing has always been true: That book or that person who can give me an idea or a new slant on an old idea is my friend.