In the year of King Uzziah's death I saw the Lord sitting on a throne, lofty and exalted, with the train of His robe filling the temple. (please read vv.1-5 again)
God's glory always accompanies His presence!
The "train" of a robe is the long part of the robe that trails behind the king. It represents the king's glory and majesty.
When Isaiah saw the Lord in all His beauty and greatness and magnificence, the train of God's robe filled the temple. That is, there was an overwhelming sense of the glory of God!
This is the same thing that happened when Solomon first dedicated the temple. 2 Chronicles 5:13-14 tells us: "Then the house, the house of the LORD, was filled with a cloud, so that the priests could not stand to minister because of the cloud, for the glory of the LORD filled the house of God."
When you have a personal encounter with God, you too will begin to see His glory—the evidence of His presence—in everything. In the circumstances of your life, in the Bible, in your prayer life, in your worship, in your fellowship with other believers, in your ministry to others, in God's provision of your needs.
At every turn you will find reasons to honor and praise God for His kingly presence filling every corner of your life.