Commentators universally highlight that Jesus is teaching a crucial principle: belief is the prerequisite for witnessing God's glorious power. He gently rebukes Martha's wavering faith, reminding her of His promise. As scholar John Calvin notes, faith doesn't force God's hand, but it 'prepares the way' for us to experience His power, while unbelief can hinder our ability to see God at work. This verse calls believers to trust God's promises even when circumstances seem impossible.