Let us be aware of the movements of the body, for example, while we are blinking, be aware; while we are breathing, be aware. Then thought arises, be aware. This is what we call Sati or self-awareness.
Self-awareness is invaluable. We cannot buy it, nor can anyone cultivate it for others. For example, when I am clenching my hand, is anyone conscious of my feeling? No one is. Outwardly, you can see I am making a fist, but you are not conscious of my feeling. Similarly, when someone is making a fist, I can see but I am not conscious of his feeling.