How do we know that grace is irresistible?

The concept of irresistible grace is vividly illustrated through the account of Mephibosheth. King David's insistence on fetching Mephibosheth, despite his lameness and inability to come on his own, symbolizes the divine nature of God's grace. This 'fetching grace' denotes that when God purposes to save, He will overcome every obstacle. Just as Mephibosheth could not resist David's call to receive mercy, so too, God’s grace draws His chosen people to Himself, ensuring their salvation will not be thwarted. This is the embodiment of invincible grace, where the sovereign will of God prevails.