On p. 315 of The Profit Motive in Ethics, Vol. 86, No. 4, pp. 312-322 (July, 1976), Flew quotes Housman differently:
    A moment's thought would have shown him this. But thought is a painful process. And a moment is a long time.    
Perhaps Flew was attempting to recall from memory the following passage from p. xi of the Preface to Housman's Juvenalis Saturae (revised edition, Cambridge University Press, 1931), which is reprinted on p. 56 of A.E. Housman: Selected Prose (edited by John Carter, Cambridge University Press, 1962):
    Three minutes' thought would suffice to find this out; but thought is irksome and three minutes is a long time.    
    
    
    
    
    
    
    
    
    
    
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