Humans are animals and like all animals we leave tracks as we walk: signs of passage made in snow, sand, mud, grass, dew, earth or moss. . . . We easily forget that we are track-markers, through, because most of our journeys now occur on asphalt and concrete--and these are substances not easily impressed.
It is the job of conscious rational thought to decide what you want, select the goals you wish to achieve-and concentrate upon these rather than upon what you do not want. To spend time and effort concentrating upon what you do not want is not rational.