Chapter 2, Verse 47 in the Bhagavad Gita pertains to Karma Yoga. It states that dutiful actions and the results of those actions are separate. While it is correct to follow and perform certain 'right' action, or duties, one must not perform the action with expectations or attachments to the seeming results or outcomes of those actions. The results and outcomes are not to be motivations for performing the actions and duties. Duties should be performed with complete detachment to what may or may not happen as a result of the action. Ultimately, the outcome is Ishwara's Will. The person performing the duty should not expect the outcome, be motivated by it, nor be bound to it (or it to them). Further, if a Karma Yogi does NOT perform a certain duty, they are not bound to the outcome of this inaction either. Neither fruits of action or inaction is bound to the Karma Yogi.
As I deepen my understanding of this truth, it continues to deepen my understanding and practice of detachment. I apply this wisdom in reducing or eliminating my expectation of an outcome, and become detached not only to the 'how and what' of an outcome, but also to it's effect or implications. For example, If my duty is certain tasks to care for my mother, there may have previously been attachments to the outcome in that my actions benefit my mother in a certain way, and that she would benefit, respond positively, and even recognize or appreciate me for my work. However, now I do these duties for the duty sake, and also for the love of service. I will perform these actions without concern of how it will be received, or what the ultimate outcome may be. Detachment has born many if not most of my internal struggles and pains. And I see that the real fruit of Karma Yoga is the opportunity to address and overcome these attachments which have caused me so much pain.
For me, I've observed the healing path of Karma Yoga to be seeming 'side-effects'. Though, arguably, it may be the real fruit of this work. While working with attachments, it is the work with the seeds of those attachments that I have found to be most beneficial. Karma Yoga will often elicit responses and reactions from an unobserved attachment, the root cause of which may at first be poorly understood. It is in the work with these reactions, first observing, then understanding and dissolving the roots of them that offers great opportunity for healing and growth.
For example, unresolved traumas may react to an 'outcome' to where there was attachment. Often, it's not clear that there was an attachment, or why there was a reaction to some outcome. While working with Karma Yoga, it is the opportunity to develop the conscious witness to the previously unknown reaction. Once these reactions are surfaced and observed, they can be worked with to resolve or integrate. Ultimately, the source of the attachment is dissolved, sometimes profoundly reducing suffering and pain. This is an effective process of using Karma Yoga to heal and evolve the soul, leading one further down the path of freedom, Joy, and ultimately Moksha.