The invisible God wished to make Himself known through the goodness He would show to Abraham. God made a covenant with Abraham to bring from him a great nation that He would bless and protect. But a covenant is an agreement; each party has a commitment to make.

Worry arises when we imagine potential problems and measure them against the resources we have right now, assuming we wouldn’t have enough if those problems happened today. The point that Christ is teaching here is that each day has plenty of issues to deal with without having to concern ourselves with problems that are only a possibility for the future. Isn’t that true?