# it will not come

"the day of the Lord will not come"

# the falling away

This refers to a future time when many people will turn away from God.

# the man of lawlessness is revealed

"God reveals the man of lawlessness". This is the same as "son of destruction" and "lawless one" in this chapter. Paul associates him with Satan, who is actively working in the world.

# the son of destruction

"the one who destroys everything he can". Paul speaks of destruction as a person who bore a son whose goal is to totally destroy everything.