Is it more useful to live in a world of possibilities or probabilities?

We've all heard the phrase "anything is possible", which is supposed to be an encouraging declaration to chase after one's most ambitious aspirations. Is this worldview, and the encouragement of said worldview, actually dangerous? Should we instead be focused on which of our goals is most probable to be achieved? JC and B-Mic Roc OD on whether we should live in a world of possibility or probability.