John Calvin Commentary Luke 24:41

"And while they still disbelieved for joy, and wondered, he said unto them, Have ye here anything to eat?" — Luke 24:41 (ASV)

But while they yet believed not for joy. This passage also shows that they were not deliberately incredulous, like persons who deliberately resolve not to believe; but while their will led them to believe eagerly, they were restrained by the vehemence of their feelings, so that they could not rest satisfied. For certainly the joy that Luke mentions arose from nothing but faith, and yet it hindered their faith from gaining the victory.

Therefore, let us observe with what suspicion we should regard the vehemence of our feelings, which, though it may have good beginnings, can quickly lead us from the right path. We are also reminded how earnestly we should struggle against everything that hinders faith, since the joy that sprang up in the minds of the apostles from the presence of Christ was the cause of their unbelief.