"Coffin" is an image of a man who, by his rejection and crimes of God's Commandments, has destroyed in himself the Divine endowments: conscience, will, and reason, so that his inner world is filled with impurity of sinful ideas, destructive religious doctrines, dogmas, philosophies and other abominations of sin, which degrade, kill and deaden his spirit, soul and body.
"Coffin" is also a spiritually-deadly state of society, filled with all kinds of vicious deeds, evil, in which all spiritual and moral principles of God's Commandments are flouted and deadly destructive, life-destroying consequences of breaking His Will are at work.
"Coffin" is a society in which there are no spiritual and moral Foundations of God's Will, no signs of true life, and which is subject to the fatally corrupting, destructive effects of rejection, the crime of God's Will