Lol, but seriously, the first time I ran a search on the subject that the Holy Spirit would manifest it's self as being of one mind, I expected to find dozens, but to my surprise I found none.(^g^)
No, but I wasn't quite refering to being of one mind (although "may they be one, Father. Even as you and I are one" is close). If each man is his own interpreter of Scripture there is no authority - or each man is the authority, to extend to determining the canon of Scripture. If the Protestant response is that God is the authority (true) and he works through the spirit (true) to ensure that we interpret without significant error (hmm - everyone?) then either Protestants would not disagree on matter of salvation or they are wrong about the influence of the HS or some small number of them have the Truth and the rest are deluding themselves and are no better than the Catholics.