אִם אֵין אָדָם מֵכִין בְּעֶרֶב שַׁבָּת מָה יֹּאכַל בְּשַׁבָּת?

ביטוי (אנגלית)

If a person does not prepare on the eve of Shabbat, what will he eat on Shabbat?

הגדרה (אנגלית)

By analogy: If a person does not prepare in advance and plan for the future—how will he be able to sustain himself?

("And they answer him and say: Fool of the world, do you not know that this world is like Shabbat, and the world you came from is like the eve of Shabbat? If a person does not prepare on the eve of Shabbat, what will he eat on Shabbat?" - Ruth Rabbah (Vilna) section 3)