'Speck' in the Bible

Why do you see the speck in your brother's eye, but fail to see the beam of wood in your own?

How can you say to your brother, 'Brother, let me remove the speck from your eye,' while you yourself don't see the beam in your own? You hypocrite! First remove the beam from your own eye, and then you can see clearly to remove the speck from your brother's eye.