We have…ALL of it…not just a proof-text or two. You want to apply Psalm 69 to Jesus (and Mary)? Fine. Then deal with this:
5 You, God, know my folly;
my guilt is not hidden from you.
Do you think that Jesus was guilty of anything? If so, please tell us what that might be. And what was His folly? I’m quite curious about this.
In the meantime, Here are some thoughts on the mis-use of Psalm 69 posted
here:
It’s a clever argument, but there are at least three alternatives to bear in mind. First, the Psalms are distinct from traditional prophesy (like Isaiah or Ezekiel, e.g.). The present concerns of the Psalmists are blended with foreshadowing of Christ. Psalm 69 is no exception. On one level, this Psalm is about someone who was falsely accused of theft (Psalm 69:4). Plenty of things in Psalm 69 foreshadow Christ, but that doesn’t mean every element is true of Him. For example, Psalm 69:5 says, “You know my folly, O God; my guilt is not hidden from you.” And Christ is sinless, of course. So the first option is simply that v. 8 isn’t strictly Christological.
Second, even if Psalm 69:8 applies to Christ, the “mother” may not be Mary – it may mean Israel. The full sentence (v.8-9), taken as a whole, says, “I am a stranger to my brothers, an alien to my own mother’s sons; for zeal for Your house consumes me, and the insults of those who insult you fall on me.” That is, the image is of mother Israel, and her sons, the Jewish people, in their home, the house of the Lord, the Temple of Jerusalem.
Third, even if Psalm 69:8 applies to Christ, and even if the mother is Mary, the other children need not be biological children. Revelation 12:17 specifically says that the Mother of Christ’s children are “those who obey God’s commandments and hold to the testimony of Jesus.”
So the three options are that v. 8 refers to (1) something exclusive to the Psalmist, (2) Israel, and (3) Christians. Of the three, I think (2) is the strongest, but any are possible. In any case, none of this strikes me as a compelling reason to declare the Church wrong (from the early Christians onward) about the perpetual Virginity of Mary.
So, once again, the verse PROVES nothing. There is a reasonable alternative to your interpretation.
For a more lengthy refutation of this Psalm 69 argument, try author Steve Ray’s paper here:
catholic-convert.com/wp-content/uploads/Documents/MarysOtherSons2.pdf