I've dropped my pebble in the ocean, and hopefully; throughout the course of the day; millions of others will drop theirs in too. No single one of us knows which pebble causes the wave to crest, but each of us, quite rightly, believes that it might be ours; an act of faith.
Pessimism doesn’t change the reality; it prolongs the status quo. And it brings everyone down. It’s only ever lose-lose. Optimism and faith coupled with pragmatism change the reality. Self-belief and self-reliance change the reality. Boldness to explore new ideas changes the reality. A vision powered by effort and energy changes the reality.