"It is important to have the open mind of a scientist.” When I was studying Physical Sciences I attended a lecture by Shri Mataji for the first time. This happened more than thirty years ago, but there are two things that are still engraved in my memory: the change in my state of consciousness after meditation, and one of the phrases Shri Mataji pronounced: "It is important to have the open mind of a scientist." Meditation and scientific method are the paths that lead me to the best results in the search of understanding. And … what is the point of experiencing and understanding if you are not able to convey it? Here’s the question that has driven me to write this book. It is a book aimed at the general public. I receive emails from people who are mainly grateful that I have put words to what they somehow felt inside, or had experienced. They are from different backgrounds, and some of them are now attending our Sahaja meditations mainly through internet. It is also helpful for people who begin to meditate, or for people that just want to have clear and scientific information about what meditation is. The meditation physiological basis is explained from the modes of functioning of our brain, in a very simple way. Meditation state: presence of the Silence mode. The Spirit: what we feel we are in Silence mode.