Christ warned not to feel overanxious for the future. He did not exempt man from a reasonable care for security. Improvidence is not a virtue, and it can become sinful presumption. In one of the most beautiful passages of the Bible, Christ points with exquisite detail the right attitude of man with regard to God's loving providence. I bid you put away anxious thoughts about food and drink to keep you alive, and clothes to cover your body.
Surely life is more than food, the body more than clothes.
All these are things for the heathen to run after, not for you, because your heavenly Father knows that you need them all. Set your mind on God's kingdom and his justice before everything else, and all the rest will come to you as well. This is a piece of highest human and divine counsel as has ever been given to man to hear. There is still a more noble form of prayer, that of gratitude and praise. Man, being a creature of God, owes him recognition as his maker and author of every good gift.