thank the beneficent obstinacy of real mothers

C.S. Lewis in The Abolition of Man:

Hitherto the plans of educationalists have achieved very little of what they attempted and indeed, when we read them — how Plato would have every infant “a bastard nursed in a bureau”, and Elyot would have the boys see no men before the age of seven and, after that, no women, and how Locke wants children to have leaky shoes and no turn for poetry — we may well thank the beneficent obstinacy of real mothers, real nurses, and (above all) real children for preserving the human race in such sanity as it still possesses.