Sometimes people think the point of meditation is to stop thinking— to have a silent mind. This does happen occasionally, but it is not necessarily the point of meditation. Thoughts are an important part of life, and mindfulness practice is not supposed to be a struggle against them. We can benefit more by being friends with our thoughts than by regarding them as unfortunate distractions. In mindfulness, we are not stopping thoughts as much as overcoming any preoccupation we have with them. However, mindfulness is not thinking about things, either. It is a non-discursive observation of our life in all its aspects.
In those moments when thinking predominates, mindfulness is the clear and silent awareness that we are thinking. A piece of advice I found helpful and relaxing was when someone said, “For the purpose of meditation, nothing is particularly worth thinking about.” Thoughts can come and go as they wish, and the meditator does not need to become involved with them. We are not interested in engaging in the content of our thoughts. Mindfulness of thinking is simply recognizing that we are thinking.
In meditation, when thoughts are subtle and in the background, or when random thoughts pull us away from awareness of the present, all we have to do is resume mindfulness of breathing. However, when our preoccupation with thoughts is stronger than our ability to let go of them easily, then we direct mindfulness to being clearly aware that thinking is occurring. Strong bouts of thinking are fuelled largely by identification and preoccupation with thoughts. By clearly observing our thinking, we step outside the field of identification. Thinking will usually then soften to a calm and unobtrusive stream.