Significance of External activity
In Dharmashastra, external activity encompasses two main aspects. First, it pertains to actions that occur outside of one's inner will or desire, suggesting that creation can transpire without direct physical effort. Second, it includes the physical actions undertaken to achieve a specific goal following mental processes such as thought, desire, and resolution. This concept emphasizes the distinction between the internal motivations and the subsequent external actions taken to realize those motivations.
The below excerpts are indicatory and do represent direct quotations or translations. It is your responsibility to fact check each reference.
Hindu concept of 'External activity'
External activity in Hinduism encompasses the physical actions taken to achieve goals following mental determination and the idea that creation can happen independently of internal desires, emphasizing the potential of action beyond personal will.
From: Manusmriti with the Commentary of Medhatithi
(1) The physical actions taken to accomplish a desired goal after the mental processes of thought, desire, and resolution.[1] (2) Refers to actions outside of one's inner will or desire; this concept highlights the idea that creation can occur without needing physical exertion or intervention.[2]
From: Mundaka Upanishad with Shankara’s Commentary
(1) Refers to actions that involve engagement with the outside world, which are said to oppose the state of being delighted in one's self.[3]