The narrator says: One day I paid a visit to Imam Ja’far as-Sadiq (a.s) when one of his sons was seriously ill. I had gone to see the ill child and I found the Imam standing at the door in an aggrieved state. Then he went inside and remained there for some time. When he came out again it was seen that his condition had changed and he did not seem as much worried as he before was. I thought that maybe the child was now better. I asked the Imam about him and he said that the child has passed away. I said, “Master! You were worried when he was alive but are no more aggrieved after his passing away?” The Imam said, “This is the practice of us Ahl ul-Bayt. We seem worried and aggrieved before the coming of a tragedy but when it actually occurs we submit to the Divine Will and we act with patience and accept with pleasure all that comes from Him.
“Satisfied with His destiny and accepting His command.”
Reference :Akhlaq al-A’imma, Morals & Manners of the Holy Imams