A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.

In this quote, Ambrose Bierce illustrates the destructive nature of self-doubt by comparing it to a person who enlists with their enemies and turns against themselves. He argues that doubting one’s abilities is akin to actively working against one’s own success. Just as a soldier who fights for the enemy sabotages their own side, a person who lacks confidence undermines their own potential, making failure almost inevitable.

Bierce suggests that self-doubt creates a self-fulfilling prophecy, where the individual is already convinced of their failure before they even begin to try. The phrase "he makes his failure certain" indicates that by doubting himself, a person sets the stage for their own defeat. The lack of belief in oneself leads to inaction or poor decisions, reinforcing the cycle of failure.

The comparison to bearing arms against oneself emphasizes how self-doubt is an internal enemy, and it is just as damaging as an external one. Confidence and self-belief are essential to overcoming obstacles, and without them, individuals can become their own worst enemies. Bierce warns that doubting oneself not only leads to missed opportunities but can actively sabotage success.

Overall, Bierce’s quote serves as a powerful reminder of the importance of self-belief. It suggests that without confidence and a positive mindset, individuals are essentially fighting against their own success. The origin of the quote, from Bierce’s critical and often cynical perspective, reflects his broader view on the human condition and the dangers of internal conflict.