Everything starts from stopping. And stopping brings about resting, calming and healing. So, the first mindful in-breath is very important because it helps us stop thinking and revive awareness. If we keep thinking during meditation, it is the waste of time and energy because nothing starts.
When we think, we live in forgetfulness. And when we stop thinking, we live in mindfulness. Mindful people can touch the wonders of life, recognize what is going on inside and around them and touch the true nature of reality. To the contrary, those who think can't do the same. In fact, they are just dreaming and seeing illusions, or projection of their mind without touching the reality as it is. That's why we need to stop first.
Thích Nhất Hạnh