The first Śloka sets the saga on the field of Dharma.
Dharma is how we respond, whatever the situation,
presuming we can sustain our view within the present.
Karma is how we respond, having lost sight of our view,
because it’s become obscured by the force of our memories.
Then Karma is the force now driving us through our memories.
So, Arjuna’s Dharma becomes obscured because of his Karma.
– Paul Harvey on Bhagavad Gītā Chapter One verse 1
In the Bhagavad Gītā, Karma is defined as a Śodhana Kriyā where,
as actions are performed, they also offer a chance to refine oneself.
Thus, whatever I do and whatever happens is a chance to refine myself.
The Bhāvana here is Ātma Śuddha where all actions are an opportunity
for purification of that which inhibits the expression of our essence.
– Paul Harvey on Bhagavad Gītā Chapter Five verse 11