Ali ibn Muhammad ibn ‘Abdallah has narrated from Ibrahim ibn Ishaq al-Ahmar from Muhammad ibn Sulayman al-Daylami his father who has said the following. 
"Once I mentioned a certain person’s intelligence, worship and religion before Imam abu ‘Abdallah (a.s). The Imam (a.s) asked, "How is his intelligence? The man replied, ‘I do not know.’ The Imam then said, "The degree of reward is based on the degree of intelligence. A man of Bani Israel worshipped Allah on an island in the ocean. The island was lush green, with many trees and abundant water. Once an angels passed by the worshipper and asked Allah to show how much reward and blessings would the worshipper receive for his good deeds. Allah showed the rewards due to the worshipper to the angel and the angel considered it very little. Allah then told the angel to stay with the worshipper as a companion. The angel then appeared to the worshipper in the form of a human being. The worshipper asked, "Who are you?" ‘ I have heard about your great worships and your spiritual position at this place and I wish to join you to worship Allah along with you." The angel said. He spent that day with the worshipper and the next day the angel said to the worshipper, "Your place is beautiful and it should only be used for worship." ‘Yes, it is but it has one shortcoming.’ The worshipper responded. "What is that?" The angel inquired. "Our Lord does not have an animal. I whish He had a donkey so that we would look after the donkey to graze all the grass around. All these grass is a waste." ‘Does your Lord have no donkey? Asked the angel. "Had our Lord had a donkey all this grass would not have turned into waste." The worshipper answered with sadness. Allah then revealed to the angel, "We reward everyone according to the degree of his/her intelligence."