Jabir asked Imam Baqir (a.s): “What is meant by perseverance with gratitude?” He said: “It means perseverance without complaining to the people. Abraham (a.s) sent the Blessed Jacob (a.s) to one of the monks for some reason. When the monk saw Jacob, he thought he was Abraham. He rushed ahead and hugged him, and said: “Welcome, friend of God.” Jacob said: “I am Jacob, the son of Issac, the son of Abraham.” The monk said: “Then why do you look so old?” He said: “Sorrow and grief, and illness has done this to me.” He was about to depart when revelation came: “O' Jacob! Why did you complained about Me near My servant?” Then Jacob fell down in prostration next to the door and said: “O' God! I will never do this again.” God revealed to him “I will forgive you, but never again do this.” From then on he never complained about any calamities. Just once he said: “I take my complaints about grief and sorrow only to God. I know something about God that you do not know.”