mamba
Legend
it's subjective, but better to me is one that makes a modicum of sense to me. I do not need a full on scientific explanation, but just saying 'you so strongly believe in e.g. Stoicism that Stoicism grants you the power to ...' just doesn't work for me. Same if you instead have 'you never bothered training, but you are convinced you can jump across this 100 yard gap, so you try and succeed'.Well, better is a highly subjective standard. What would you consider "better" or "acceptable"?
If you do not want gods for this, then give me something else that is not essentially 'this person is crazy, but somehow that grants him powers'. Let it be ancestral spirits, being exposed to some powerful magic flux in his youth and having become a mutant / superhero due to this. Something that is not just 'delusions grant powers'....