The title of this post is the title of a post by William Watson ("Billy") Birch who thinks that he has found a weakness in Calvinism (though, as he admits, he's not actually responding to a Calvinist)(link to his post).
His essential argument is this (I am paraphrasing): "Reformed theology says God blinds the reprobate. But Reformed theology says that everyone is totally depraved. Therefore, God is placed in the odd position of blinding the blind."
But Mr. Birch cannot deny that God does harden the heart of some men. God hardened the heart of Pharaoh, for example. Furthermore, virtually every time we mention this to any Arminian who is opposed to Calvinism (there are Arminians who are simply ignorant of Reformed theology) they invariably insist that the man has to harden his own heart first. How exactly is this supposed to be different? God hardens the hard? God blinds the blind?
The argument may have a superficial appeal to Mr. Birch's fan base, but it lacks substance as evidenced by how easily it is turned on his own argument.
The problem, of course, is that Mr. Birch fails to appreciate the way in which God blinds the blind. God refuses to open their eyes - refuses to provide them with a cause that would lead to the effect of their seeing.
Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand. And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive: for this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables: that seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
Furthermore, contrary to the theology of Mr. Birch, God is quite willing to take credit for concluding all in unbelief:
Romans 11:32 For God hath concluded them all in unbelief, that he might have mercy upon all.
How does one conclude (i.e. enclose or shut) in unbelief an unbeliever? The same way one blinds the blind. Without God's grace we can do nothing:
John 15:5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.