According to Osho, doubt is an open, courageous inquiry that says 'I don’t know—let me find out,' while negativity is a premature 'no'—a belief-based conclusion as closed as a borrowed 'yes.' Doubt refuses both belief and disbelief, persists in not-knowing until personal experience, and leads beyond all polarities to truth; negativity (and positivity) halt the pilgrimage before it even begins.
Doubt means staying curious until you see for yourself; negativity means already saying no without looking.