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There is as much difference between the counsel that a friend giveth, and that a man giveth himself, as there is between the counsel of a friend and of a flatterer. For there is no such flatterer as is a man's self.

Francis Bacon, Basil Montagu (1859). “The Works of Francis Bacon, Lord Chancellor of England: With a Life of the Author by Basil Montagu”, p.35, Philadelphia : Parry & McMillan
There is as much difference between the counsel that a friend giveth, and that a man giveth himself, as there is between the counsel of a friend and of a flatterer. For there is no such flatterer as is a man's self.