The highest expression of our human nature is arrived through the purification of our minds. This is the purpose of the practice of meditation through the use of an anchor of attention . Our mind is by nature comparable to a clear sky, the thoughts in our mind are compared the clouds. To clear away the clouds in meditation whenever you notice that your mind is lost in thought you acknowledged that and return back to your anchor of attention and the sky like nature of mind. With time and practice, this clearing away of the clouds results in the breaking of the sheets of snow and ice that we are encased in or the breaking up of our delusions and our habitual patterns of reactivity.