Luther: On Universalism

Our human nature is prone to conclude that if it were not God’s judgment that all men be saved, it would be an outrage, tyranny, and injustice.

And indeed, this is not one of the slightest offenses with which the devil assails us and with which he tries to move our faith to look askance at God. The devil knows that one of the noblest and most precious virtues of faith is to close one’s eyes to this, ingenuously to desist from exploring the why and the wherefore, and cheerfully to leave everything to God. Faith does not insist on knowing the reason for God’s actions, but it still regards God as the greatest goodness and mercy.

Faith holds to that against and beyond all reason, sense, and experience, when everything appears to be wrath and injustice. This is why faith is called Argumentum non aparentium, the sign of things not seen [Heb. 11:1], indeed, the opposite of what is seen.

Yeah, pretty much.