There is a debate between Lord of the Rings fans about that moment in "The Return of the King" where Sam almost kept the ring for himself. Remember? After Frodo was stung by Shelob and Sam thought he was dead, He took the ring and tried to complete the quest on his own. But when he learned that Frodo was actually alive, He went in like the badass that he is and saved Frodo from the Orcs.
Then, When Frodo asked for the ring back, there is a moment of hesitation and a strange look in Sam's eyes. Could the pure Sam have given in to the will of the one ring? even for a second? Well, if you ask Sean Astin, the answer is a resounding NO! The actor explained lately that the look he gave was a moment of hesitation, but he only hesitated because he didn't want to put the burden of the ring back on his dear friend's neck.
Sam is pure. Be like sam.