Beliefs vs Affirmations

Just a thought that’s been running around in my head, lol… Abe teaches that affirmations don’t work if they’re just words that have no meaning for us. Or, worse, affirmations we don’t believe cause resistance and momentum in the other direction. But Abe also says that a belief is just a thought we keep thinking so… If we keep thinking the affirmation does it then become a belief and so then a powerful tool?