The Source of all Cause and Effect is Within.
And where is this "within"?
It is outside of Time and Space, therefore it
cannot exist in any part of the experience that is physical.
The "Mind" you seek to understand, and control, is not within your body.
It is also not "out there" somewhere.
You can measure and observe "effects" with your physical senses.
But "cause" cannot be measured or observed.
Cause must, and can only, be practiced.