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" Dumbledore also knew he could trust Snape to be the rightful owner of the Elder Wand because with all powerful magical objects, Snape handles them without greed, not for personal gain but to protect others. In his third year, Harry saw that his Invisibility Cloak, one of the Deathly Hallows, worked perfectly for Snape because Snape was using it in the belief that he would protect children from murderers. Dumbledore, in contrast, says he once borrowed the Cloak from Harry’s father “out of vain curiosity, and so it could never have worked for me as it works for you, its true owner.” (HP/DH, 720) The sword of Gryffindor cannot be owned but presents itself of its own volition to worthy Gryffindors, yet it permitted Snape to handle it. "
― Lorrie Kim , Snape: A Definitive Reading