Shadows are cast because of light. In darkness there is no shadow. A shadow is cast because something is there. Take the substance away, and there is to shadow. Take the light away and there is no shadow. You cannot have one without the other.
Colossians 2:14-17 Blotting out the handwriting of ordinances that was against us, which was contrary to us and took it out of the way, nailing it to his cross; And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it. Let no man therefore judge you in meat or in drink or in respect of an holy day, or of the new moon or of the sabbath Which are a shadow of things to come; but the body is Christ
Hebrews 10:1 For the law having a shadow of good things to come and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.
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2 Corinthians 3:3-17 Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart. And such trust have we through Christ to God-ward: Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God; Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life. But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away: How shall not the ministration of the spirit be rather glorious? For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory. For even that which was made glorious had no glory in this respect, by the reason of the glory that excelleth. For if that which is done away was glorious, much more that which remaineth is glorious. Seeing then that we have such hope, we use great plainness of speech: And not as Moses which put a vail over his face, that the children of Israel could not stedfastly look to the end of that which is abolished: But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ. But even unto this day, when Moses is read, the vail is upon their heart. Nevertheless when it shall turn to the Lord, the vail shall be taken away. Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.