What is the nature of the mind? It has clarity and it is knowing. To understand what this means it is useful to contemplate the mind in comparison with a mirror.
A mirror is a reflective surface behind a piece of glass. Images appear in the mirror. When we look at an image in a mirror we do not normally see the glass, nor do we see the reflective surface. We are so caught up in the images that appear in the mirror we do not notice the actual mirror. It is the same with the mind. We perceive the things which appear to our mind as truely existing the way that they appear.
If you can get some sense of the nature of the mind, which is not the things that appear to it, you will be able to relax the mind.
How can you recognise what is the mind itself without getting caught up in those things and events that appear to it?