All the more vile is the stupidity of those persons who open heaven to all the impious and unbelieving without the grace of Him whom Scripture commonly teaches to be the only door whereby we enter into salvation.
John CalvinOn the contrary, therefore, Christ declares that the doctrine of the Gospel, though it is preached to all without exception, cannot be embraced by all, but that a new understanding and a new perception are requisite; and, therefore, that faith does not depend on the will of men, but that it is God who gives it.
John Calvin