The Chovos HaLevavos quotes a pious person who says, “Did Hashem ever ask you to perform tomorrow’s mitzvos today?”

Of course not!

Similarly, Hashem gives us today what we need today, and tomorrow He will give us what we need tomorrow.  If we want to look at today’s allotment and fret that it does not cover tomorrow, this is suffering of our own creation.

~ R’ David Sutton