1 Corinthians 12, 1-3

Now in regard to spiritual gifts, brothers, I do not want you to be unaware.

You know how, when you were pagans, you were constantly attracted and led away to mute idols. Therefore, I tell you that nobody speaking by the spirit of God says, "Jesus be accursed." And no one can say, "Jesus is Lord," except by the holy Spirit.

Encyclical Letter Ad Petri Cathedram Nº 6, Author: John XXIII

All the evils which poison men and nations and trouble so many hearts have a single cause and a single source: ignorance of the truth—and at times even more than ignorance, a contempt for truth and a reckless rejection of it. Thus arise all manner of errors, which enter the recesses of men's hearts and the bloodstream of human society as would a plague. These errors turn everything upside down: they menace individuals and society itself.