10.21.31   Where then and when did I experience my happy life, that I should remember, and love, and long for it? Nor is it I alone, or some few besides, but we all would fain be happy; which, unless by some certain knowledge we knew, we should not with so certain a will desire. But how is this, that if two men be asked whether they would go to the wars, one, perchance, would answer that he would, the other, that he would not; but if they were asked whether they would be happy, both would instantly without any doubting say they would; and for no other reason would the one go to the wars, and the other not, but to be happy. Is it perchance that as one looks for his joy in this thing, another in that, all agree in their desire of being happy, as they would (if they were asked) that they wished to have joy, and this joy they call a happy life? Although then one obtains this joy by one means, another by another, all have one end, which they strive to attain, namely, joy. Which being a thing which all must say they have experienced, it is therefore found in the memory, and recognised whenever the name of a happy life is mentioned.