The Orthodox Christian message always starts out describing the Love God gives, the merciful kind, and then ends with a description of the love which God demands, the obedient, conforming kind. Under this scenario, The Love which God gives must always be subordinate to justice. Supposedly, God's Love for the Christian is possible because Jesus satisfied the need for justice; and eternal punishment for non-Christians is required because of an unsatisfied requirement for justice.
This concept of how God's Love works has led to countless sermons, trying to reconcile the obvious contradiction between mercy and justice. You can have mercy or justice, just not both at the same time. The Bible says as much: Mercy rejoiceth against judgment (James 2:13). "Judgment" in this context means a decision concerning "justice", so mercy supersedes justice.