"إذا كنت تريد أن تحافظ على سر، يجب أن تخفيه عن نفسك أيضاً"

Simplified Meaning:

Sometimes, to truly keep something hidden, you have to act like you don't even know it yourself. Imagine you have a favorite hiding spot for your money. If you keep thinking about that spot, you might give yourself away by looking at it too often or showing signs of anxiety. But if you almost forget where you hid it, you won't act differently, and no one will suspect anything. In history, spies had to keep secrets not just from enemies, but also from their own minds. They trained to hold information so deeply that they wouldn't accidentally reveal it under pressure. This can be useful in everyday life too. If you're trying to keep a surprise party a secret, don't bring it up in conversation or think about it all the time. The less you think about it, the less likely you are to accidentally let it slip. By keeping it out of your own mind, you avoid accidentally giving clues to others.