Page 518 - BERESHIT

The Zohar explains that the Angel of Eisav’s assault on Yaakov Avinu
refers to an attack on the support of Torah. I understood this to mean not
just the physical sustenance of Am Yisrael but also their future
development. This refers to the Torah learning of the children. They make
their teachers wise by their stimulating inquiries and are the future adults
of Am Yisrael.

The Angel thus attacked Yaakov on a small but vital nerve, referring to
the youthful vitality of these children. This is why the Torah forbids the
gid hanasheh, in order to rectify that harm.

Torah can be learned even amidst poverty. We need to remember that
Hashem is our sole provider. Hashem gave the Torah to the generation
who relied fully on Him for their daily manna.