It seems ironic that the Pharisees wanted Jesus to perform a sign from heaven right after he miraculously fed four thousand people. They didn't want a miracle—they knew Jesus was capable of those—but a sign from heaven, or a sign from God, testifying to Jesus' identity. They didn't realize that his presence was a sign from heaven, for he had stepped out of glory to minister to humankind. (3 Minutes/700 Words)