That is not so strange. I've seen it in similar forms elsewhere. It basically means you don't actually know what's in a man's mind and if it's found that you pr

That is not so strange. I've seen it in similar forms elsewhere. It basically means you don't actually know what's in a man's mind and if it's found that you protected a deceitful person you're worse than if you let the things unfold by themselves. For example, you guarantee for a friend that you 'know' could not do something bad. You actually don't know.