Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more important than food, and the body more important than clothes? Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? Who of you by worrying can add a single hour to his life? And why do you worry about clothes? See how the lilies of the field grow. They do not labor or spin. Yet I tell you that not even Solomon in all his splendor was dressed like one of these. If that is how God clothes the grass of the field, which is here today and tomorrow is thrown into the fire, will he not much more clothe you, O you of little faith? So do not worry, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ For the pagans run after all these things, and your heavenly Father knows that you need them. But seek first his kingdom and his righteousness, and all these things will be given to you as well. Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own. Matthew 6:25-34
“With what sort of worry is our Lord concerned in Matthew 6:25-34? Quite clearly, he is not advocating carefree irresponsibility. What he teaches is that even material necessities are not valid causes of worry among the heirs of the kingdom. Therefore our physical needs, however legitimate they may be, must never supplant our prior commitment to the kingdom of God and his righteousness. Furthermore, he teaches that these same needs become opportunities for living a life distinctively from the surrounding pagans who never learn to trust God for even the basic necessities.”
D.A. Carson in The Sermon on the Mount: An Evangelical Exposition of Matthew 5-7 (Grand Rapids: Baker, 1990) 86.