The quote "Doubt destroys more than certainties" from Arturo Pérez-Reverte's book "Sabotage" suggests that uncertainty can have a far-reaching negative impact, often outweighing the risks associated with being certain. This implies that doubt can lead to missed opportunities and hesitation, ultimately hindering progress and decision-making.

In a broader context, the quote highlights the importance of confidence and conviction in our actions and beliefs. When doubt infiltrates our minds, it can paralyze us and prevent us from taking necessary risks, whereas having firm certainties can guide us towards success and fulfillment.