What do you pay attention to, the weeds or the flowers?
If you were gardening, sure you have to pull the weeds out. If you don’t take the weeds out they are going to crowd the flowers and you won’t have healthy flowers.
But if all you do is notice the weeds then you’re not going to pay any attention to the flowers. The flowers are going to wilt and wither. They’re going to get eaten by worms. They’re not going to be strong.
Also, all you’re looking at your whole time gardening is the stuff you don’t want to look at. You’re not looking at the stuff that you started gardening for.
Likewise, with your feelings, your emotions, your life, anything that you pay attention to is what you’re giving attention to. You’re giving your energy away. So make sure you’re giving it away to the right thing.