The Lord told Moses, "I will rain bread from heaven for you, and the people shall go out and gather a day's portion every day .... Gather of it every man as much as he should eat ...." He who had gathered much had no excess, and he who had gathered little had no lack. Moses told them, "Let no man leave any of it until morning." But they did not listen to Moses, and some left part of it until morning, and it bred worms and became foul. Ex. 16
Jesus said, "Give us today our daily bread." Matt. 6:11
Jesus told a parable: The land of a certain rich man was very productive. And he began reasoning to himself, saying, "What shall I do, since I have no place to store my crops?" And he said, "This is what I will do: I will tear down my barns and build larger ones, and there I will store all my grain and my goods. And I will say to my soul, 'Soul, you have many goods laid up for many years to come; take your ease, eat, drink, and be merry.'" But God said to him, "You fool! This very night your soul is required of you." Luke 12:16-20
Our greatest saints, heroes, and martyrs lived one day at a time. How could they have faced the hard roads God took them down, if they'd lived any other way? It is crushing to the spirit to contemplate the possible sorrows of tomorrow. As Elisabeth Elliot told us, "Do the next thing." Don't try to fix yesterday or insure against tomorrow. Great peace is found in only doing the few things that today requires.
I'm preaching to myself, I hope you know.