The mind controls the activities of physical brain. Scientists say there is a primitive mind and a developed mind. The medulla oblongata, lower part of the brain, is called the primitive mind because it is responsible for basic thoughts. When the mind is engaged in worldly thoughts one cannot think of anything beyond; because the mind can only think of one thing at a time. When does one silence his mind, higher centres of the brain can be activated.
Silence gives rise to deeper thoughts and knowledge. Sages and saints, seers and seekers, in all ages and places, have sat in deep silence in order to search profound truth of life. In the depth of that silence the light of knowledge dawned on them.
Dr.Mahesh Chandra Panda