John Trapp on Mark 6:5

Verse 5. He could do there no mighty work] He could not, because he would not. Note here the venernous nature of infidelity, that transfuseth, as it were, a dead palsie into the hands of omnipotency, disabling Christ, in a sort, to do such a man good. Christ by his absolute power can do all things: by his actuall power he can do no more then he will do.