The law of karma is a special instance of the law of cause and effect, according to which all our actions of body, speech and mind are causes and all our experiences are their effects. The law of karma explains why each individual has a unique mental disposition, a unique physical appearance and unique experiences. These are the various effects of the countless actions that each individual has performed in the past. We cannot find any two people who have created exactly the same history of actions throughout their past lives, and so we cannot find two people with identical states of mind, identical experiences or identical physical appearances. Each person has different individual karma. Some people enjoy good health while others are constantly ill. Some people are seen as very beautiful while others are seen as very ugly. Some people have a happy disposition that is easily pleased while others have a sour disposition and are rarely delighted by anything. Some people easily understand the meaning of spiritual teachings while others find them difficult and obscure.
Every action we perform leaves an imprint, or potentiality, on our very subtle mind, and each imprint eventually gives rise to its own effect. Our mind is like a field, and performing actions is like sowing seeds in that field. Virtuous actions sow seeds of future happiness and non-virtuous actions sow seeds of future suffering. These seeds remain dormant in our mind until the conditions for them to ripen occur, and then they produce their effect. In some cases, this can happen many lifetimes after the original action was performed.
It is because of our karma or actions that we are born in this impure, contaminated world and experience so many difficulties and problems. Our actions are impure because our mind is contaminated by the inner poison of self-grasping. This is the fundamental reason why we experience suffering. Suffering is created by our own actions or karma – it is not given to us as a punishment. We suffer because we have accumulated many non-virtuous actions in our previous lives. The source of these non-virtuous actions is our own delusions such as anger, attachment and self-grasping ignorance.
Once we have purified our mind of self-grasping and all other delusions, all our actions will naturally be pure. As a result of our pure actions or pure karma, everything we experience will be pure. We will abide in a pure world, with a pure body, enjoying pure enjoyments and surrounded by pure beings. There will no longer be the slightest trace of suffering, impurity or problems. This is how to find true happiness from within our mind.