After a profound period of stillness and waiting, divine revelation suddenly breaks through to Ezekiel. The primary approach among commentators is that this moment marks the exact end of a seven-day period [מצודת ציון, רד״ק], bringing a close to the prophet's quiet isolation [ביאור שטיינזלץ].
God appears to the prophet to directly confront his recent behavior. Up until this point, Ezekiel had been sitting among the exiles in their settlements [מלבי״ם], remaining completely silent and overwhelmed for days. God informs him that this continued silence is a severe sin that actively endangers his own soul. His true purpose is to act as a watchman for the Israelites, tasked with warning the people of approaching disaster. He carries the heavy responsibility of delivering God's message and urging the wicked to abandon their destructive paths so they might live.
The consequences of this mission are absolute. If Ezekiel remains silent and fails to warn the people, the wicked will indeed die for their own sins. However, God will hold the prophet responsible for their deaths, demanding their blood from His hands. Conversely, if Ezekiel fulfills his duty and delivers the warning, he secures his own life, even if the wicked refuse to repent and ultimately perish for their crimes. Delivering God's warning is therefore an existential obligation for the prophet; by speaking out, his primary achievement is the salvation of his own soul [אברבנאל].