Charles H. Spurgeon on Psalms 69:23

Let their eyes be darkened, that they see not. They shall wander in a darkness that may be felt. They have loved darkness rather than light, and in darkness they shall abide. Judicial blindness fell upon Israel after our Lord's death and their persecution of his apostles; they were blinded by the light which they would not accept. Eyes which see no beauty in the Lord Jesus, but flash wrath upon him, may well grow yet more dim, till death spiritual leads to death eternal. And make their loins continually to shake. Their conscience shall be so ill at ease that they shall continually quiver with fear; their backs shall bend to the earth (so some read it) with grovelling avarice, and their strength shall be utterly paralysed, so that they cannot walk firmly, but shall totter at every step. See the terrifying, degrading, and enfeebling influence of unbelief. See also the retaliation of justice: those who will not see shall not see; those who would not walk in uprightness shall be unable to do so.