'Unable' in the Bible

For from the first making of the world, those things of God which the eye is unable to see, that is, his eternal power and existence, are fully made clear, he having given the knowledge of them through the things which he has made, so that men have no reason for wrongdoing:

For the mind-set of the flesh is hostile to God because it does not submit itself to God’s law, for it is unable to do so.

Those who are in the flesh cannot please God.

Let darkness come over their eyes that they may be unable to see, and make Thou their backs continually to stoop."