Myrrh is a perfume and medicine made from the resin from a genus of thorn trees. In the Word, is represents our early knowledges about spiritual things. In the Christmas story, the wise men bring gifts to the Lord: gold, frankincense and myrrh. Gold is listed first, because it is the inmost -- signifying good, e. g. the good that we do when we love the Lord and the neighbor. The frankincense is next. It signifies rational truth -- the set of true ideas that we know, not about external things like cars or cooking, but about what is really good, and what is really true. Rational truths are built on earlier knowledges that we learn, before we have really made them our own. Those early knowledges about spiritual things -- often learned in childhood -- are represented by myrrh. In a way, these gifts are really a reciprocation. We can't actually give them to the Lord until the Lord has given them to us. We start out by learning and doing the Lord's law (myrrh). The Lord can then call up those memories to become rational truths (frankincense). Then, over time, and with effort, those truths can be transformed into good (gold). The wise men from the East had gone through this process of learning and becoming vessels that could receive truths and goods. They were able to perceive the Lord's birth, find him, and bring gifts to him.