I do not doubt that Jeane Dixon may have said words to that effect. She was originally a Catholic, and unfortunately got too mixed up in pseudo-occult stuff later on.
My memory - as told to me as a child in the 60s - was that she said that "the Chair would be empty", referring to the Chair of Peter. Perhaps this was a different locution?
I guess it begs the question where one's authority lies: either talking snakes or the Word of the Lord. The former of the two doesn't really have all that good of a track record. Scripture says: "The begining of wisdom lies with fear of the Lord" (Jo 28:28; Psa 111:10; Prv 1:7; 9:10; 15:33; Isa 11:2; 33:6).
In that regard Scripture intimates how wise Paul indeed was; his fear of the Lord being an absolute and utter terror felt right in the very marrow of his bones:
"For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad. Knowing therefore the terror of the Lord, we persuade men;" - II Cor 5:10,11a
The apostle Peter illuminates the source of Paul's terror:
"For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God? And if the righteous scarcely be saved, where shall the ungodly and the sinner appear?" - I Pt 4:17,18
The writer to the Hebrews states this most eloquently:
"Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace? For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people. It is a fearful thing to fall into the hands of the living God." - He 10:29-31
Paul is quite clear about the danger inherent of such things as Marian apparitions (and talking snakes):
"For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ. And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works." - II Cor 11:13-15