The word therefore is doing heavy lifting. Jesus has just said that no one can serve both God and money, and now He draws the line straight from that truth to our worry. If God is our Master, then anxiety about whether He will provide is a logical contradiction. The slave trusts the master’s provision. The question Jesus presses is whether we have actually settled who our Master is.
Notice the little word more. Jesus is not merely comparing life to food. He is exposing what a life dominated by worry is missing. Jay Adams puts it plainly: when things are what you live for, worry about things is inevitable. If your days are spent anxious about provision, you are treating the container as though it were the contents. You were made to live larger than that, anchored not in what keeps life going but in the One who gives life its meaning.
Anxiety always shrinks us. It pulls our gaze down to the next bill, the next meal, the next uncertainty, and away from the God who stands over all of it. Jesus is not scolding us for having needs. He is inviting us to stop letting our needs define the size of our lives.