Just as the cost of Isaiah’s call would be high, so the Lord Jesus did not make His call to discipleship any easier. On the contrary, Jesus stressed the cost of following Him. Following Jesus means full obedience and the giving up of all other plans that a person might prefer to make for themself.
The seraph touched my mouth with it and said, “Now that this has touched your lips, your guilt has departed and your sin is blotted out.” Isaiah 6:7 (NRSV)
Isaiah was left with the lasting impression of God as sacred and set apart, glorious beyond measure, pure beyond imagining, calling God the Holy One of Israel more than any other writer in the Bible.
God met Isaiah in his sorrow, and in that moment of personal bereavement and spiritual concern, gave the young prophet a Christophany—a vision of Christ.
Angels can never share in the incommunicable attributes of God. As God the Son, the Lord Jesus Christ contains all the fullness of God.