It's always struck me as interesting that Isaiah chooses his lips to talk about. He doesn't say that his heart is unclean, or his hands, or his mind, or his thoughts. He says that his lips are unclean. I think he says it because he knows that if he survives, he will have to tell people about this, and he cannot tell people about it because there are no words that accurately and fully capture all that he was experiencing. His lips cannot do the job that they must do.
Echoes of a Greater Glory
As Christians, we are called to be both salt and light on this earth (Matthew 5:13-16). Salt, to add flavor, to enhance, to preserve those with whom we mingle. Light, to reflect, to beckon, to illuminate the darkness around us. We ourselves are to be echoes of a greater glory, reverberating with traces of the divine and reminding others that there is in fact more to life than the same old everyday stuff that dominates their time.