How difficult it is to receive, and to go on receiving, from others a love that does not depend on our own attraction, can be seen from an extreme case. Suppose yourself a man struck down shortly after marriage by an incurable disease which may not kill you for many years; useless, impotent, hideous, disgusting; depending on your wife’s earnings; impoverishing where you hoped to enrich; impaired even in intellect and shaken by gusts of uncontrollable temper, full of unavoidable demands. And suppose your wife’s care and pity to be inexhaustible. The man who can take this sweetly, who can receive all and give nothing without resentment, who can abstain even from those tiresome self-deprecations which are really only a demand for petting and reassurance, is doing something which Need-love in its merely natural condition could not attain. 

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Lewis, C. S. The Four Loves. London: William Collins, 2016. 160. Print.