以赛亚领悟他是该灭亡的、嘴唇不洁的人
对于在荣耀里之基督的异象，以赛亚的反应是说，“祸哉，我灭亡了！”以赛亚看见这异象，就领悟他是该被了结的，是该灭亡的。以赛亚接着说，“因为我是嘴唇不洁的人，又住在嘴唇不洁的民中。”由此可见，我们必须注意我们的嘴唇，注意我们的说话。我们的话大部分是邪恶的，因为我们说的大多是批评的话。这是我们嘴唇不洁的原因。不洁的事，诸如闲谈、发怨言和起争论，都使教会生活变得像醋一样。我们若把闲谈、怨言和争论除去，就会发现我们没有甚么可说的。我们需要像以赛亚一样，领悟我们的嘴唇是不洁的。
每一个真正看见主异象的人都是蒙光照的。这异象立刻暴露他，并把他带到光中。在路加五章，当彼得看见主的时候，立刻对主说，“离开我，因我是个罪人。”我们看见自己多少，在于我们看见主多少。
以赛亚得洁净
以赛亚看见自己是不洁的，之后就藉着一个撒拉弗得了洁净；撒拉弗乃表征神的圣别。以赛亚是从坛上的红炭得着洁净的。这红炭表征基督在十字架上所完成之救赎的功效。藉着撒拉弗用坛上的红炭所完成的洁净，除掉了以赛亚的罪孽，洁净了他的罪。
在六章这经历之前，以赛亚难道没有被神洗净么？不错，以赛亚曾得着洁净，但他看见自己仍是不洁净的。这指明我们都需要看见自己乃是不洁的总和。无论我们得过多少次的洁净，我们仍是不洁的。我们都必须认识自己到这个地步。
在我们的经历中，我们洁净不洁净，是在于良心的感觉；而我们良心的感觉是在于我们对主的看见。我们看见主有多少，就决定我们会有多少被洁净。我们越看见主，越被暴露，就越得着洁净。当我们的良心得了洁净，没有亏欠时，我们就能接触主。按照我们蒙光照的良心，我们是洁净的，但按照我们在旧造里的实际光景，我们是不洁的。只要我们留在旧造里，我们绝不能完全洁净。我们需要身体得赎。我们的身体一旦得着救赎，就要脱离旧造。那时，我们才完全是洁净的。
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The Purging of Isaiah — Isa. 6:5, 7
Isaiah Realizing That He Was Finished and a Man of Unclean Lips
Isaiah responded to the vision of Christ in glory by saying, “Woe is me, for I am finished!”. As a result of seeing this vision, Isaiah was terminated, finished. Isaiah went on to say, “For I am a man of unclean lips, and in the midst of a people of unclean lips I dwell”. By this we can see that we must pay attention to our lips, to our speaking. A great percentage of the words we speak are evil, because most of our words are words of criticism. Nearly every word that we speak concerning any matter or any person is a word of criticism. This is the reason that our lips are unclean. Unclean things such as gossip, murmuring and reasoning make the church life taste like vinegar. If we eliminate gossip, murmuring and reasoning, we may find that we have very little to talk about. Like Isaiah, we need to realize that our lips are unclean.
Everyone who truly sees a vision of the Lord is enlightened. The vision he sees immediately exposes him and brings him into light. When Peter saw the Lord in Luke 5, he immediately said to the Lord, “Depart from me, for I am a sinful man, Lord!”. How much we realize concerning ourselves depends on how much we see the Lord.
The Purging of Isaiah
After Isaiah realized that he was unclean, he was purged by one of the seraphim, signifying the holiness of God. Isaiah was purged with an ember from the altar. This ember signifies the effectiveness of Christ’s redemption accomplished on the cross. This purging by the seraphim with an ember from the altar took away Isaiah’s iniquity and purged his sin.
Had Isaiah not been washed by God before his experience in chapter six? Yes, Isaiah had been cleansed, but he realized that he was still unclean. This indicates that we all need to realize that we are a totality of uncleanness. No matter how many times we may be washed, we are still unclean. We all must come to know ourselves to this extent.
In our experience, whether we are clean or unclean depends on the feeling of our conscience; and the feeling of our conscience depends on our seeing the Lord. How much we see the Lord determines how much we will be cleansed. The more we see the Lord and are exposed, the more we are cleansed. When our conscience is cleansed and is void of offense, we are able to contact God. According to our enlightened conscience, we are clean, but according to the actual facts of our situation in the old creation, we are not clean. As long as we remain in the old creation, we can never be completely clean. Once our body is redeemed, we will get out of the old creation. At that time, we will be completely clean.