So, Jesus says, in Matthew 6:33 (ESV) , at the end of a teaching about how the Father can and will take care of His children.. “but seek first the Kingdom of God and His righteousness, and all these things will be added to you”
It’s obvious from the context of verses 25 onward what these things are.. He’s listed all that we shouldn’t be anxious about.. Our lives, what we will eat and drink, what we will wear, and the health of our bodies. So, He’s saying, “Trust ME”
Being God in human form, He knew full well that not being anxious about things goes against our nature. So, He’s listed examples from nature .. birds eat what is provided for them, lillies are clothed in beautiful flowers.. these are things that were taken for granted every single day.
So, let me give another example, a more modern one.
Today, we sit comfortably in a machine which is much heavier than air as it hurtles down a strip of concrete, confident that it (and we) will safely be lifted up into the air and travel to our destination without any mishaps.
Flying is not natural to man. Even today, those who do so for the first time (and even after that) are filled with fear even though so many of us have experienced it for ourselves. Yet, over and over, the law of aerodynamics is proven to be true.
So here’s my point.
Not being anxious is not easy, it doesn’t come naturally to us. And yet, when we read the promise in this scripture, given to us by no lesser authority than God in human form, we still doubt.
Yet we trust man’s discovery of God’s principles of how a bird can fly.