I am going to teach you a meditation by which you can experience how thoughts enter your mind. Close your eyes. Thoughts are coming from outside; from the space. Every one of you have established a bank account of thoughts that reside in the space as Akashik records. Akash in Sanskrit means the space. Now the thoughts are coming as energy particles and then they come and hit you; your right eyes in the retina. The retina has billions of cells. Your Ego would accept only a few thoughts and most of them are bounced back into the space and those received by the retina of the right eye will travel to the left brain, the process also happens in the left eye as well. The left eye retina accepts a few thoughts allowed by your Ego and then those thoughts travel to the right brain. The two brains then actualize the thought or thoughts. If you keep your eyes closed and a few times feel the process in the two eyes and in the two brains, you will begin to understand the dynamics.