There is an extraordinary post on “private judgement” and “scriptural proof” on Weedon’s blog, which is followed by an even more extraordinary discussion. I won’t repeat it all here. Go and read it on his blog (including all the comments–he really riled the Orthodox readership!).
Pastor Weedon claims that all doctrines should be “proven” from scripture. Fair enough, but what amounts to “proof”? Take for instance, Pastor Weedon’s own proffered “proof” for the perpetual virginity of the Blessed Virgin, Ezekiel 44:2:
And he said to me, “This gate shall remain shut; it shall not be opened, and no one shall enter by it; for the Lord, the God of Israel, has entered by it; therefore it shall remain shut.”
That might “prove” it for Pastor Weedon, and for St John Chrysostom, St Gregory of Nyssa and St Cyril of Jerusalem. But it would hardly “prove” it for many of his Lutheran colleagues.
Likewise, Catholics believe that all the teachings of the Church are “scriptural”–but we don’t expect you to swallow this proposition easily. Getting you to agree with this assessment is the task of Catholic apologetics.