If you have both a cat and a fish, and the cat eats the fish, you should not only blame the cat but also yourself. The same principle applies: when you know that human nature has weaknesses but do not take precautions, then when you suffer losses, instead of resenting that person, you should reflect on yourself. Everyone is human, with both good and evil in their nature; we can never forget that just because someone appears kind, they also have their own weaknesses.