He led him to Jerusalem, and set him on the pinnacle of the temple, and said to him, "If you are the Son of God, cast yourself down from here,

 Here Luke the doctor writes. In the grip of a major fever--every word is a medical term. In the grip of is the medical Greek for someone definitely laid up with an illness. The Greek medical writers divided fevers into two classes--major and minor. Luke knew just how to describe this illness. 