"Therefore I say unto you, Take no thought for your life, what you shall eat, or what you shall drink; nor yet for your body, what you shall put on. is not the life more than meat, and the body more than clothing?" (Matthew 6:25)
Quote from C. Spurgeon:
"Not only is...anxiety wrong, but it is a sin of great gravity. It is not simply a constitutional infirmity which we may excuse, a mere trifle we need not be concerned about, but rather it is a foul iniquity...
It calls into question the goodness and care of our Creator. It manifests a lack of faith in His wise and gravious providence. And if we be Christians, it betrays doubt of our Father's love. And surely these are evils of the deepest dye.
"Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof" (vs. 34). By "tomorrow" is here meant the future. In the second half of this verse Christ answers a question which might be evoked by His prohibition in the first: if we must not look forward anxiously, how will it fare with us in the time to come?...What good can your worrying do? It does not empty tomorrow of its trials, but it empties today of its strength and comfort; it does not enable you to escape future trouble, but it unfits you to cope with it when it does come...Cross not your bridges before you come to them, but cheerfully shoulder the burden of today and trustfully leave the future to God."