Hasan bin Sahl asked Dinar bin 'Abdullah, "What is your religion?" He said, "I never thought that anyone alive would ask this question, for it is the question of Munkar and Nakir to the dead."
[...] wrong doing and sin are really maladies of the heart, just as fever and pain are maladies of the body. When someone who has been ill recovers, he regains his [previous] strength and [...] others actually become healthier, stronger and more vigorous than before, for the remedy is [so] strong and overpowering, and it so completely overcomes the causes of the weakness and illness, that sickness becomes their way to health. Or as the poet said: "Perchance a reprimand from You is healing And perchance a body is strengthened through illness." --- Ibn Qayyim al-Jawziyya, The Invocation of God