Should we believe we have no enlightenment whatsoever?

Should we believe we have no enlightenment whatsoever? I mean, acting like you're the Dalai Lama, famous sage or future Buddha may well come off as offensive and stupid. But if we authentically believe we are identical to a Buddha, just somewhat unrealised, is that as insane and arrogant? If you are going to answer "that's what you realise" then please provide a reference point.