There are people who will carelessly drop pieces of glass on a path and not clear them up.

"There are people who will carelessly drop pieces of glass on a path and not clear them up. Someone else will clear it up, they think; never mind if they hurt themselves! And they go on their way... But what they don't know is that human destiny is not a straight line: its path is circular. So, one way or another, in this incarnation or the next, they will have to come back to the same place; that is, they will have to suffer the consequences of their action.The example of the broken glass is an image to show you that those who sow danger will one day themselves be its victims. If they have dug holes or set traps along the road, there is a law that will bring them back to those exact same spots to fall into the holes or the traps. Then they will have time to meditate on their misadventures, to complain about there being wicked, stupid people around and try to find out who they are! Obviously, it won't occur to them that they themselves did it! Anyone who lives their life constantly saying, 'Who cares what happens after I'm gone!' is creating all the difficulties that they will one day or other be saddled with."

Omraam Mikhaël Aïvanhov