FIML illustrates karma in the sense that karma is an action that initiates a cycle of cause and effect.
For example, if you do not care about what your partner is saying, you will not understand how you are listening and thus you will not understand yourself. If you are not honest with your partner, similarly, you will not be able to perceive the depths of meaning in your own listening and speaking. Your not caring and/or not being honest are actions that will initiate a cycle of delusion, a cycle of less than optimal communication, less than optimal mutual understanding, and less than optimal self-understanding.
You harm yourself when do not care or are not honest. Of course, there are degrees of caring and honesty. But if partners do these actions well-enough, they will see for themselves that caring even more and being even more honest has very real and very important benefits for each of them.
If you care about what your partner is saying, you will come to understand how ideas, values, and meanings actually function in your mind during dynamic moments of communication. And this will save you from a great deal of delusive thinking and feeling. The same is true for being honest. If you are honest with your partner, you will help them free themselves from delusive thinking and feeling. They will see that you are being honest and respect you for that. In return they will be more honest with you.
And all of this will become clearer and clearer to both partners as they progress in FIML practice. These cycle of good karma—good cause and effect—will enrich and liberate both partners
In addition to the above, it is good to see that there are significant selfish reasons to be honest and to care about your partner.