myself, oneself

to believe / to trust / to believe in (God, etc.)

[one]self

essential, vital, extremely important

essential, vital, extremely important

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

(polite) do you believe in God?

a photograph of oneself, a photographic self-portrait / (especially) a selfie

to take a photograph of oneself, to take a selfie

talking about oneself (especially, when the audience is not interested)