We will fail once we choose to accept failure. But, until then, there is always a possibility, if someone is truly determined to achieve something, that they will.
The question is whether we want it enough. Are we prepared to put in the time, the dedication, and deal with the short-term disappointments, rejection, long hours and toil to attain the goal?
Yet when one decides that they have failed and cannot succeed, that becomes the point of no return.