Puritan Board Senior
Perkins is talking about a completely different issue though, and in a different category - he's talking about a missing word in a passage, which doesn't change the meaning of the passage. So the Perkins quote does not support the argument RSC is making.
As a point of clarification, Perkins is speaking specifically about the words in Galatians 3:1 "that ye should not obey the truth." So a phrase rather than a single word.
In answer to the two questions:
1. Has the Word of God been kept pure in all ages?
2. Is there any uncertainty as to minor points in the text?
Perkins is able to answer both with "yes". That is in sharp distinction to the strict (and forced) interpretation of "kept pure in all ages" many TR advocates use WCF 1:8 for. It can be shown over and over again that the men of that historical context could both affirm that purity, and recognize that there were variants they could not determine which was original. They recognized it and it didn't seem to bother them or hinder their faith in the purity of God's word.