What is the spiritual meaning of gold, silver and brass, and shittim wood?

 ...” And this is the offering which ye shall take of 
Them; gold, and silver, and brass” (Exod. 25.3)
What is the spiritual meaning of gold, silver and brass, and shittim wood? And for what reason has God speaks of the divine nature. We all need divine wisdom, divine strength, and divine knowledge. And God has provided these in His son (1 Cor. 1.30). When we do things according to the divine plan of the Lord Jesus Christ, we are gathering gold for His Sanctuary.
    Silver speaks of redemption. Our Lord was sold for the price of a slave. But He gave his own life-blood to save us. Wherever you see silver in the Tabernacle it speaks of redemption, of the price our lord paid to save us. When we are born again, we become the “purchased possession” of the Lord Jesus Christ. Our spirits and our bodies now belong to Him. We are “bought with a price2 (1 Cor. 6.20). Now I can no longer say that my hands, my feet, my lips, my eyes are my own. They belong to the Lord Jesus Christ because He has purchased me, and bought me by His own Blood. (1 Pet. 1.18-19).
    Our bodies are the temples of His Spirit (1 Cor. 6.19). That’s why we must glorify God with them, through our dress, our habits, our manners our speech (1 Thess. 4.45-5. 1 Tit. 2.9-10). That is pure silver. My body and my spirit have become the purchased possession of my Lord, and now I cannot dress as I used to do. Now I cannot waste my money upon worldly things, and upon worldly glory. Now I must glorify my Lord through my dress, manners and ways. It is the privilege of every believer thus to bring silver to God’s House.
    The Brass speaks of judgement. Those who looked on the serpent of brass, acknowledge thereby that they themselves were under judgement and that it was the devil (the serpent) who was responsible for their disobedience and death. By His Cross, our Lord Jesus has defeated our enemy. He has crushed him, and through faith, we have the victory in him.
    God speaks of the divine nature; the silver of that price of redemption that our Lord has paid us; while brass speaks of the judgement which our Lord had to bear on our behalf. All of us are commanded to gather the materials and bring it to Him.