Isaías 56

Isaías 56:5

And what could be greater than the reward the Lord bestowed upon His mother, whom He honored above all others? For He deemed no gift more abundant than virginity, as Scripture teaches us. For thus the Lord spoke through Isaiah: Let not the eunuch say, I am but a dry tree. Thus says the Lord to the eunuchs: Whoever keeps my commandments, and chooses what I desire, and embraces my covenant, I will give them a place in my house and on my wall, a name better than sons and daughters, an everlasting name will I give them, which shall not be cut off. He promises others that they will not fail: did he allow his mother to fail? But Mary does not fail, the teacher of virginity does not fail; nor could it be possible that she who carried God would think of carrying a human being. — On the Instruction of the Virgin and the Perpetual Virginity of Mary, 6.45