Jesus was concerned about unity during his final supper with his apostles. When praying with them, he spoke of his desire that all his disciples be one, just as he and his Father are one. Their unity would give a powerful witness, offering clear evidence that Jehovah had sent Jesus to the earth to do God’s will. Love would be a mark of Jesus’ true disciples that would contribute to their unity. (John 13:34, 35) Jesus’ emphasis on unity is understandable. He had noticed a lack of unity or harmony among the apostles, such as during his final meal with them. As had happened before, a dispute arose over “which one of them was considered to be the greatest.” (Luke 22:24-27; Mark 9:33, 34) Another time, James and John requested that Jesus give them prominent places alongside him in his Kingdom.​—Mark 10:35-40. w18.06 8 ¶1-2