The Buddha's image of each person's karma as seeds sown in a field
"The Buddha’s image of each person’s karma is seeds sown in a field: Some seeds are sprouting right now; others are waiting to sprout. When you see the sufferings of others, you’re seeing only their seeds that are currently sprouting. The good seeds waiting to sprout, you can’t see. At the same time, you don’t know what bad seeds are lying in wait in your own field. Still, the most important seeds in your field are the ones you’re planting right now, because they can determine whether you’ll suffer from your old seeds or not. So you look for the good old seeds in other people’s fields that may be ready to sprout, and try to get them to plant good new seeds so that they won’t have to suffer from any bad seeds already sprouting. After all, that’s how you’d like them to treat you when your bad seeds start to mature. Acting in this way, you create good karma for yourself, and a more humane world all around." ~ Thanissaro Bhikkhu "Karma is Individual"