Why does the message about the coming judgments call people to accept God's offer of salvation while there is still time?

Les explains that this is an admonition for those not ready to meet the Lord and be raptured out of all this, calling them to consider God's offer of salvation while the time is available. He ties that urgency to the wrath of God being finally consummated in the last seven judgments or plagues, called the vials or bowl judgments. He notes that a bowl can be poured out instantaneously, whereas a different container would take longer. The heavenly vision then shows the martyred tribulation saints already in glory, having gotten the victory over the beast, his image, his mark, and the number of his name, standing on the sea of glass with the harps of God, singing the song of Moses and the song of the Lamb.