A physically dead person cannot think, will, or act in any way with his body. A spiritually dead person can be spiritually active; but he cannot think, will, or in any way act in a way pleasing in God’s sight.
The apostle Paul (under inspiration) reveals this, in Ephesians 2:2 where we read, “Wherein in times past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience.” Take note of the fact that Satan is presented as doing spiritual things, but his spiritual death caused works of disobedience. He is that prince of the power of the air. Spiritual death brings forth works of hatred against God. It means that he works that which calls for everlasting punishment in God’s wrath.
Spiritual death, therefore, means that all men came into this world absolutely incapable of walking in any way that pleases God. They will go against everything that is spiritually good. They will refuse one hundred per cent to do what God demands that man should do, as far as the spiritual nature of that work is concerned.
Remember that, just as you received physical life entirely apart from your will, so also was spiritual birth given to you only because God eternally decreed to bestow it.