When you inquire 'Who am I?' if you are honest, you'll notice that it takes you right back to silence instantly. The brain doesn't have an answer, so all of a sudden there is silence.
Beside all the small reasons we assign, there is a great reason for the existence of every extant fact; a reason which lies grandand immovable, often unsuspected behind it in silence.
Sit in meditation ! But do not think ! Look only at your mind ! You will see thoughts coming into it ! Before they can enter, throw these away from your mind till your mind is capable of entire silence.