A.w. Tozer said this quote

“ With the veil removed by the rending of Jesus' flesh, with nothing on God's side to prevent us from entering, why do we tarry without? Why do we consent to abide all our days just outside the Holy of Holies and never enter at all to look upon God? We hear the Bridegroom say, `Let me see thy countenance, let me hear thy voice; for sweet is thy voice and thy countenance is comely.' (Song of Sol 2:14) We sense that the call is for us, but still we fail to draw near, and the years pass and we grow old and tired in the outer courts of the tabernacle. What doth hinder us?The answer usually given, simply that we are `cold,' will not explain all the facts. There is something more serious than coldness of heart, something that may be back of that coldness and be the cause of its existence. What is it? What but the presence of a veil in out hearts? A veil not taken away as the first veil was, but which remains there still shutting out the light and hiding the face of God from us. It is the veil of our fleshly fallen nature living on, unjudged within us, uncrucified and unrepudiated. It is the close- woven veil of the self-life which we have never truly acknowledged, of which we have been secretly ashamed, and which for these reasons we have never brought to the judgment of the cross. It is not too mysterious, this opaque veil, nor is it hard to identify. We have but to look in our own hearts and we shall see it there, sewn and patched and repaired it may be, but there nevertheless, an enemy to our lives and an effective block to our spiritual progress.This veil is not a beautiful thing and it is not a thing about which we commonly care to talk, but I am addressing the thirsting souls who are determined to follow God, and I know they will not turn back because the way leads temporarily through the blackened hills. The urge of God within them will assure their continuing the pursuit. They will face the facts however unpleasant and endure the cross for the joy set before them. So I am bold to mane the threads out of which this inner veil is woven. It is woven of the fine threads of the self-life, the hyphenated sins of the human spirit. They are not something we do, they are something we are, and therein lies both their subtlety and their power. ”