This concept is cited extensively within Puranic and Vedic literature.
Once one can get passed all superficial matters and observe another being, perceiving them as possessing a unique personality and mind of their own…A intricate purpose and path of their own, which is connected to you through the very nature of reality itself.
By mere existence upon the same planet, the same country or the same city, one human being affects another, often without conscious realisation.
Therefore, non-attachments represents being detached from one’s thoughts.
It is the separation of the individual from their own thoughts and opinions in detail as to not be harmed mentally and emotionally by them.
For instance, a sociopath can be threatened and perplexed by emotion due to the unpredictability that it brings.