If a stray cat came to your house and you fed it, it would come back, and the more you feed it, the more it comes back. This is just like the habit of worrying, the more you worry about something, the more the worries grow and the more they will come back. If you keep feeding the cat, it will grow bigger and scarier, taking over your garden; this is the same thing that can happen with your worries. The pleasure is though, once you know this, you can start the process of change. The simple answer is, if you don’t want the worries and the fears, don’t feed them, just like the cat; if you don’t feed it over time, it will go away.