Answer:
Jonas shivered because he was nervous to be on stage. What helped me understand why he was shivering was when it said "for he was a shy and quiet man" and "waiting to be called on stage.... the last of the ceremonies. The most important." I can tell why he was shivering because some people get super nervous and get goosebumps or shiver. He could also be nervous because his father kinda knew what his assignment would be, so he could be nervous he would get a bad or dangerous assignment.
Step-by-step explanation: