At the risk of misrepresntation, here it is in brief ...
All living creatures are responsible for their karma — their actions and the effects of their actions — and for their release from samsara.
One of the basic principles of karma is that every soul (entity) has free will. There is always freedom of choice.
Law of Causation: Karma is simply cause and effect.
Bhagwad Gita - a jewel of India's spiritual wisdom has this has a great related principle:
"You have a right to perform your prescribed action,but you are not entitled to the fruits of your action.
Never consider yourself the cause of the results your activities,and never be associated to not doing your duty."
(Translated from Sanskrit:-"Karmanye Vadhikaraste Ma Phaleshu Kadachana,
Ma Karma Phala Hetur Bhurmatey Sangostva Akarmani")