In her book "Faces," Martina Cole reflects on the wisdom of her mother, who often highlighted the importance of intelligence and common sense. The quote emphasizes a perceived lack of intelligence in someone, illustrating how insufficient brainpower can lead to foolish actions. This humorous yet blunt remark serves as a critique of individuals who fail to use their mental faculties effectively.

The phrase implies that without proper understanding or judgment, one is incapable of even the simplest tasks, like handling gunpowder safely. Cole's mother uses this colorful expression to convey her thoughts on intellect, suggesting that some people are so absent-minded that they are virtually incapable of achieving anything significant, even if their lives depended on it.