“There is nothing impossible to him who will try,” usually attributed to Alexander the Great, who had taken most of the known world by thirty. The interesting claim isn’t that he was fearless but that he moved before doubt had time to settle in.
Doubt isn’t a fixed quantity you either have or lack; it accumulates. The longer a decision stays open, the more the mind fills the gap with reasons to hesitate. Acting quickly isn’t recklessness, it’s denying doubt the time it needs to compound.
Which is why hesitation costs more than failure. Failure at least produces information and closure. Hesitation produces neither: it quietly retires possibilities without ever testing them, so the loss never registers as a loss. And the order of confidence and action is usually backwards. You don’t wait to feel ready and then move; you move, and readiness assembles behind the action. Motivation tends to be downstream of behaviour, not upstream of it.
The literal version, that nothing is impossible if you try, is false; effort doesn’t guarantee outcomes. The usable core is narrower. When a decision is genuinely open and the only thing stopping you is accumulating hesitation, acting early is the cheaper mistake.