I suppose my question is, with respect to this and other descriptions of karma in this thread: why believe it to be true?
Is it a religious belief, which works for you? Do you think that there is actually sufficient evidence to say we all SHOULD believe it?
NO I am not talking from a theological perspective at all. I am not certain if religion has much to do with karma to be honest,
although this is where it has emerged from in literature, I don't create secure beliefs for areas of existance of a
life I have not experienced, as if, there is an after life.Perhaps, and perhaps not, we have no way of knowing.
I can only wonder what happens when our energy is released from our body, and a lot of things in the mystical form we only speculate
and wonder; but in the same way that I believe paradise and hell are concepts that exist in life and not in an after life.
I know what the others are saying, but I am speaking from the psychological perspective.
Proven, in a sense that when one's preconscious/unconscious, is open, a lot of the material that pours out, proves it.
The unconscious when you know how to interpret it and during "working out" of your "demons" so to speak, it all follows a pattern whic unfolds pretty much
with all. How you live your life, forms your character, and karma I call the parts of character formation,
that unless you come to "heal" or "work through" and integrate, the pattern repeats itself in your life.
This is something that has been proven as being so for everyone, and where deep psychology is based on.
What you are unaware of, turns against the self, or harms others when expressed out-whether consciously or unconsciously.
However, the core of ourselves has a spiritual base, in that what organized religion tries to convey and fails loudly,
since the unconscious does not express itself in an ordinary language, and hence most people miss the point when they try to understand it, but
so disillusioned at religion and the meaning of it or its role.
The same way that we speak of humility and pride. The deeper core of the self, it is of a spiritual basis, and hence humility
is its essence and substance, which comes through that. As we reach the surface, when we have not integrated our outer self (the ego), where pride is a large portion
of it, is where karma forms.The inner part is placid, where as the outer, protective, aggressive, self interested and self survival oriented.
Hence karma, is of how the ego part of ourselves which executes the thoughts out into actions and of the decisions we chose to act out upon,
gathers momentum as karma, when the core is not involved in it when humility is lacking in our actions.
I am uncertain if you can go as deep in order to understand what I am trying to say. Sometimes i feel a real depth in you, and I deeply connect with that
and other times you speak purely from the outer part of the ego, so you can't understand me that the difference in you is very obvious to me.
Unless I get you in that deep part of you-which I have felt of this kind-you will then perhaps understand me.
I cannot speak of other's beliefs, as you can see that varies a lot and it is personal. But I can only speak from my own experience and others I have come to view and experience with them and hence formed my own strong and deep beliefs.
Should we all believe it? As Human Beings and part and parcel of it, is that we form beliefs according to our personal experiences, and not all share the same.

You can take the horse to the water, but you cannot make it drink. People are full of defences (part of the creation of karma) and protective of what they take in-and very obstinate when it comes to form their belief system. They cannot see outside the square box. They enter into endless debates.
Once you come to that shared base we all have, it is difficult not to see, what is trully there. Yet, I understand, that even so, it will always remain an individual choice-of what one chooses to believe.