Marriage is not at all what romantic lovers imagine it to be; it is an institution founded upon an instinct; to be successful, it requires not only physical attraction, but will-power, patience, and the always difficult acceptance of "the other"; finally, if these conditions are fulfilled, a beautiful and lasting affection can be established - a unique and, to those who have never known it, incomprehensible mingling of love, friendship, sensuality, and respect, without which there is no true marriage.

Un Art de Vivre (The Art of Living) (1939) - The Art of Marriage