"Only among people who think no evil can Evil monstrously flourish"

This quote by Logan Pearsall Smith suggests that when individuals are not knowledgeable about the potential for evil, it can grow and end up being more powerful. He is suggesting that when people are not watchful and do not acknowledge the capacity for evil, it can become more common and more dangerous. He is also recommending that when people are not knowledgeable about the potential for evil, they are most likely to be benefited from by those who are willing to do evil. This quote is a tip to be aware of the capacity for evil and to be watchful in acknowledging it and preventing it from growing and becoming more powerful. It is likewise a tip to be familiar with the potential for evil in ourselves and to take steps to avoid it from taking control of our lives.