People don’t know this about Luther, but before he ever went into the monastery he had already distinguished himself as one of the most brilliant young scholars
in Europe in the field of jurisprudence. He was a master of law and he took that genius
and examined the Old Testament law and then what he did was he measured himself by the
law of God and it was driving him crazy. God is holy and He demands holiness from His
creatures. And if a person really thinks that they’ve achieved that holiness they are
in the worst of all kinds of forms of self-delusion. So the simple answer to assurance is:
our assurance can only come when we trust in Christ and in Christ alone for our justification.