Why Jesus Told People To Shut Up

.... well, he told them to keep quiet...

A suggestion:
"Jesus knew how easily His miracles would be misunderstood; they would gather a crowd of followers who were interested in Him exclusively because he could do signs & wonders. Jesus wanted people to see that His miracles were signs of the kingdom of God, and that it was submitting to the reign of God, not being a spectator of wonders, which really mattered." --Sinclair Ferguson