This diagram was created by H.E. Tsem Tulku Rinpoche to show us in a very simple and direct way how our choices lead us to certain results.
From the left side of the diagram, we can see that we are all subject to negative karma, good karma/merits and neutral karma. The blue line is the negative karma path, the black line is the good karma path and the red line is the neutral karma path.
The diagram essentially illustrates that everyday we are faced with choices, and every action (or lack of it) has a result. If we put in positive action, such as effort, Dharma work etc., we will have positive results. If we put in negative action, such as laziness, selfishness etc., we will have negative results.
Simple really, isn't it.
Rinpoche stressed - every day, we are at a crossroads. We choose which path we wish to take, so we should not be surprised at the results. He also shared that even though the day before we screwed up and made mistakes, today is a new day and we can still change our future by the choices we make today. For example, if we forgot to say our prayers the day before, we don't just stop doing them, we just continue today. Often we try to change our pattern of behaviour, eg stop smoking, exercise more etc but once we 'fall off the wagon', we just stop. That's just giving up. We should persevere. Even if we fall off the wagon, we can simply climb back on and keep on going.