Yes, for the people of belief, death is the door to divine mercy, while for the people of misguidance, it is the pit of everlasting darkness.
O sick person who worries unnecessarily! You worry at the severity of your illness and that worry exacerbates it. If you want your illness to be less severe, try not to worry. That is, think of the benefits of your illness, the recompense for it, and that it will pass quickly; it will remove the worry and cut the illness at the root.
In fact, worry doubles the illness, for it causes an immaterial illness of the heart underlying the physical illness; the physical illness subsists through that and persists. If the worry ceases through submission, contentment, and comprehension of the reason for the illness, a large part of the illness is eradicated; it becomes less severe and in part disappears. Sometimes a minor physical illness increases tenfold just through anxiety. If the anxiety ceases, nine tenths of the illness disappears.
Worry increases illness. It also an accusation against divine wisdom and a criticism of divine mercy and complaint against the Compassionate Creator. For this reason, the person who worries receives a rebuff and it increases his illness contrary to his intentions. Yes, just as thanks increases bounty, so complaint increases illness and tribulations.
Furthermore, worry is itself an illness. Its cure is to recognize the wisdom in illness and its purpose. Since you have now learnt these, apply the salve to your worry and find relief! Say “Ah!” instead of “Oh!”, and “All praise be to God for every situation” instead of sighing and lamenting.
O my impatient sick brother! Although illness causes you an immediate suffering, your illness through the past until today produces a spiritual pleasure and happiness arising from the reward received for enduring it. From today forward, from this hour even, the illness does not exist, and certainly no pain is suffered from non-being. And if there is no pain, there can be no distress. You become impatient because you imagine things wrongly. For both the physical illness prior to today, and its pain, have departed; all that remains are its reward and the pleasure at its passing. This should afford you profit and happiness, so to think of past days and feel grieved and impatient is crazy. Future days have not yet arrived. To dwell on them now, and to feel upset and impatient by imagining a day that does not exist and an illness that does not exist and distress that does not exist, is to impart existence to three degrees of non-existence – if that is not crazy, what is?