Necessity, which frequently exists only in the mind, is less often the mother of invention than of obstinacy, and the obstinacy of those three years exacted from France a penalty which continued to exert its effects over the years, especially in World War II, and which cannot be fully summed up even now.
What It Means
This is a placeholder explanation generated by the low-overhead model. It interprets "Necessity, which frequently exists only in the mind, is less often the mother of invention than of obstinacy, and the obstinacy of those three years exacted from France a penalty which continued to exert its effects over the years, especially in World War II, and which cannot be fully summed up even now." in the context of "Pg. 18" to mean that wisdom is timeless.
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About Bernard Brodie (military strategist)