The truth comes during Gaara’s fight with Kimimaro (Part II) and is later reinforced by the Fourth Kazekage’s Edo Tensei confession.
Yes, Gaara’s mother, , loved him unconditionally. While Gaara spent most of his life believing he was a hated monster, the truth revealed during the proved that her love was the very source of his protection. The Eternal Protection did gaara's mother love him
In the Naruto universe, chakra connects people. The series establishes that strong feelings can imprint upon the physical world. While Shukaku’s sand manipulation is a jutsu, the automatic defense—the "Shield of Sand" that activates even when Gaara does not will it—is revealed to be the physical manifestation of Karura’s will. The truth comes during Gaara’s fight with Kimimaro