Quote from Manny in Heavy is the Head
Manny: And as Hodor blocked the door to save his friend Bran Stark, Bran had a vision of a younger Hodor saying, "Hold the door, hold the door. Hold door." And finally, "Hodor," the only word he would say for the rest of his life, a life that was now ending. Haley: [voice breaking] He knew. Hodor knew his whole life that his destiny was to save his little friend. Just like you have saved from embarrassment at Comic-Con, so thank you, Manny.