My friend's child is ill. How can I send a message to comfort him?

Illness comes like a mountain, and illness goes like reeling. It will be fine in a few days. If there is anything I can do, you're welcome. My friend's child is ill, and his condition is very serious. Parents are often depressed, demoralized and even pessimistic. Give some comfort to friends, say more words of care and encouragement, and make them feel that they are not alone. With the support of friends, they will help their children overcome the disease.