From the standpoint of human’s senses, the person who passed by here a few hours ago left nothing behind except his or her footprints. But to dog’s sense of smell, a scent is detected. Only humans don’t know that. In terms of ordinary people’s senses, the things done a few days ago, be they good or bad, left no mark on them except the memory. But in the eyes of the wise, virtuous or evil karma has made its mark. It’s just that ordinary people are not aware of it.

~ Khenpo's blog published on 17 March 2014