An Argument That an Eternal Hell is Just

One of my philosophy professors presented this schematized version of Jonathan Edwards' argument that hell is eternal and justly so.  I've always liked it

1. A just punishment is a deserved punishment. 

2. The deserved punishment for a wrong action is proportional to the evil of the action. 

3. The evilness of an action is a function of the weight of the obligation violated. 

4. The obligation to love, honor, and obey someone is in proportion to that person’s loveliness, honorableness, and authority. 

5. God is infinitely lovely, honorable, and authoritative (i.e., sovereign over us). 

C1. Therefore, wrong actions against God (“sins”) are infinitely evil (from (3.), (4.), and (5.)). 

C2. Therefore, wrong actions against God (“sins”) are deserving of an infinite punishment (from C1 and (2.)).

C3. Therefore, an infinite punishment for wrong actions against God (“sins”) is just (from C2 and (1.)).

(4.) seems like the weak link here.