Isaiah's commission came through a direct vision of God's throne, which shows that God always sets up His prophets Himself and that no one should set himself up as one; self-appointment is the key to recognizing false prophets. In the year King Uzziah died, Isaiah saw the Lord sitting on a high and lifted-up throne, with His robe filling the temple. Fiery seraphim, whose name means flames, stood above it, each with six wings, crying "Holy, holy, holy." The doorposts shook and smoke filled the house, probably shading Isaiah from the full glory of God. Isaiah cried "Woe is me, for I am undone!" because he was a man of unclean lips who had seen the King. He felt as though his body were coming apart and could not remain standing. A seraph touched his mouth with a live coal from the altar and declared his iniquity taken away, showing that God must cleanse and sanctify a person before that person can stand in His presence, as only God can. Isaiah then answered God's call, "Here I am! Send me." God's grace led him quickly from "Woe is me" to "Here I am." His task was to warn a hard-hearted people whose ears God blocked, so that they would understand Isaiah's warning only after going through what he foretold. God does the same cleansing and sanctifying with His people now.

Isaiah's commission came through a direct vision of God's throne in the year King Uzziah died. God always sets up His prophets directly, and no one should set himself up as a prophet, which is the key to recognizing false ones. Isaiah saw the Lord sitting on a throne, high and lifted up, with His robe filling the temple. Fiery seraphim, whose name means flames, stood above Him, each with six wings, crying "Holy, holy, holy is the Lord of hosts." The doorposts shook and smoke filled the house, which likely shaded Isaiah from the full glory of God. Isaiah cried, "Woe is me, for I am undone!" because he was a man of unclean lips who had seen the King. He felt as though his body were coming apart and could not remain standing. A seraph touched his mouth with a live coal from the altar and declared his iniquity taken away and his sin purged. Only God can cleanse and sanctify, and He did so before He sent Isaiah. Then Isaiah heard, "Whom shall I send?" and answered, "Here I am! Send me." God's grace led him quickly from "Woe is me" to "Here I am." His message was to warn a hard-hearted people, whose ears and eyes God purposely dulled so they would have to go through what He warned of and afterward understand Isaiah's warning. God cleanses and sanctifies His people today in the same way.

In the vision described, the calling of Isaiah provides a poignant parallel to the scene of profound worthiness and divine commissioning. Isaiah, in his vision, beholds the Lord seated on His throne, surrounded by seraphim who praise God (Isaiah 6:1-2). Overwhelmed by the sight, Isaiah is struck by his own uncleanness and unworthiness to gaze upon the Lord of Hosts (Isaiah 6:5). Yet, a seraph touches his mouth with a coal, purging his sin and removing his iniquity, thus making him worthy for divine use (Isaiah 6:6-7). Following this cleansing, Isaiah hears the Eternal's call, asking, "Whom shall I send, and who will go for Us?" Isaiah responds eagerly and receives his commission to deliver a message to Judah (Isaiah 6:8). This event underscores the theme of worthiness through divine purification, highlighting the transformative power of God's intervention to prepare His servants for significant tasks.

Isaiah's vision of the Lord on His throne in the Temple (Isaiah 6:1-4) overwhelmed him with the contrast between God's purity and his own defilement, so that he cried, "Woe is me, for I am undone! Because I am a man of unclean lips." The Hebrew word for "lips" is the same word translated "language" in Zephaniah 3:9. His confession does not necessarily mean he habitually swore. Judah's real fault was unfaithfulness to God and acceptance of paganism, so the problem lay in the heart, not merely in foul speech. Sin begins in the heart and escapes through the mouth, which is the visible extension of the heart. Before God could use him, Isaiah had to be purified. A seraph touched his mouth with a live coal from the altar, declaring his iniquity taken away and his sin purged. What was really cleansed was his heart. Afterward he still spoke ordinary Hebrew, but his words were true and honest and reflected a different spiritual reality. This purification by fire, followed by a multitude of Messianic prophecies, parallels Zephaniah 3:8-9, where fire precedes a pure language and calling on God. It also foreshadows the tongues of fire on the apostles at Pentecost, AD 31, which prepared them to witness for Christ and preach the gospel.