Harry Potter was saved by a mother's love more than once. Harry may not of had his mother but he had a lot of comfort from mother like figures. Whenever Harry needed comfort it was always from a mother figure.
Sometimes i wish i had godfather who was an escaped prisoner of Azkaban just so i could use that line of Harrys as an excuse to scare people into leaving me alone and giving me what i want. he'd have to be a wizard of course