Rabbinic commentators interpreted the law of leaving the corners of one's field for those in need in light of their own concerns about the poor.
In Jewish sources, the leaf is a metaphor for the fragility and durability of life.
Jewish texts on social justice describe the tension between providing what is needed and providing what is affordable.
"Give a man a fish, and you feed him for a day; teach a man to fish, and you feed him for a lifetime." How many fish do we buy, and how many nets?
Jeff Spitzer mines Maimonides' 8 levels of Tzedakah for guidance on contemporary issues in tzedakah.