Matthew 6:26 connects God's provision to observation of creation: "Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they?" The argument is not that you will never be anxious β it is that the Father who feeds creatures that do not work for food has not overlooked you. Jesus grounds the argument in the observable, not in abstraction.
Philippians 4:19 β "But my God shall supply all your need according to his riches in glory by Christ Jesus" β was written to a church that had just sent Paul material support when he was in prison. The promise is in the context of concrete financial need. Paul has been through want and abundance both. The supply he describes is real, and it comes from "riches in glory" β a supply not subject to market conditions.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.