“Visit the sick, and ask them to pray for you, since their prayer is equal to the prayers of the angels. Whenever one gets ill at night and accepts it with pleasure, God will record the reward of sixty years of worship for him.”
Imām (a.s.) was asked: “What do you mean by accepting it with pleasure?”
Imām (a.s.) said: “It means that he does not complain to anyone about his illness.”"
Imām Ja’far ibn Muhammad al-Sādiq (A.S) | [Reference: Mishkat ul-Anwar, Sec 7, Chp 2, Hadees 1641]