Isaiah 25:7 (b) This is typical of the blindness which Satan has brought over the minds and hearts of the Gentile nations. It is described more fully under the figure of blindness in2Co 4:4.
2 Corinthians 3:14 (a) This represents the peculiar unbelief which fills the hearts and minds of the people of Israel as they read the Old Testament and cannot see CHRIST depicted there.
Hebrews 6:19 (b) The word is used to describe that mysterious space that separate us from GOD, but through which by faith we come to GOD.