When someone survives a life-threatening situation, he brings a Korban Todah, a thanksgiving offering, to express his gratitude to G-d. Interestingly, although the Todah is a type of Korban Shelamim, which can generally be eaten for two days and one night, the Todah can only be eaten for one day and one night. Why?
One explanation is that the person bringing the Todah has recognized one particular miracle, but may still be overlooking countless others. The Torah therefore limits the time to eat it to one day, because tomorrow will bring new miracles for which to be grateful.
We say in Shemoneh Esrei, “We thank You for Your miracles that are with us every day.” G-d is constantly protecting us through miracles, many of which we never notice.
The Netziv once explained that even the nations could recognize G-d’s miracles for the Jewish people. They knew how many times they had plotted against the Jews, only to see their plans fail.
The lesson is simple: we shouldn't only thank G-d for the miracles we notice. We should train ourselves to recognize the countless miracles happening around us every day.