In this quote from Lawrence Durrell's book Justine, the author suggests that humans constantly seek logical explanations to justify their belief in irrational or absurd ideas. Despite the lack of rational basis, there is an innate desire to make sense of the world and our beliefs, even when they defy reason. This reflects the struggle between rational thought and the often inexplicable nature of human faith or conviction.

The quote highlights the paradox of human cognition, where seeking rational reasons becomes a way to validate the seemingly unfathomable. It emphasizes how our intellectual efforts are sometimes directed at giving meaning to beliefs that may inherently lack rational foundation, revealing the complex relationship between reason and belief in our lives.