John Calvin on John 6:14

14. Those men, therefore. The miracle appears to have been attended by some advantage, that they acknowledge the author of it to be the Messiah; for Christ had no other object in view. But immediately they apply to a different and improper purpose the knowledge which they have obtained concerning Christ. And it is a fault extremely common among men, to corrupt and pervert his truth by their falsehoods, as soon as he has revealed himself to them; and even when they appear to have entered into the right path, they immediately fall away.