Justin Bieber - Believe Lyrics Meaning

Everyone keeps saying that this song is about his fans but I actually believe it was written to his mother. Just think about it; when he had nothing, his mother was there for him. She kept believing in him or as he says «your faith in me was so clear». And I don’t know, the part where he says «you knew one day I would be standing tall» really makes me think that this song was a thank you to his mother.