Have a mind like the spacious sky and let the thoughts be like clouds: the clouds do not affect the sky, the sky does not affect the clouds. In our practice we can try to be like this. Allow any thought to arise without judging it. I am putting it in a very simple way. I know judging is a very strong conditioning that we need to work with, but this is what the practice is: not reacting to thoughts when they come. In the same way that they come, they will go again when you are having this spacious abiding in a non-reactive mind.
This technique can be seen as developing a mind like a mirror, just reflecting things as they are. This simile, the mirror-like mind, I have come across in many spiritual traditions. When something that is considered beautiful comes before a mirror, it is reflected just as it is, and the same thing happens with something that is considered ugly. Applying this to our everyday lives, when a positive emotion comes we just allow that positive emotion to be there as it is. When joy is there, just be with the joy. And when monsters come, just reflect the monster as it is. Sadness, just the sadness; fear, just the fear. Just reflecting it as it is. No plus to the joy, no minus to the sadness, both simply reflected as they are.
In everyday life we may be able to do this. If you are reacting to your emotions, you can explore and investigate your reactions. It does not matter if you react. This is one aspect of what can be described as having a mirror- like mind.