Boundaries, the importance of

Shabbos epitomizes a concern for kedusha. Of the two and a half masechtot devoted to shabbos, most of the discussions revolve around reshuyot (domains), eruvin and muktzha, all issues involving boundaries and the dedication of spaces and items for distinct purposes. In other words, shabbos is about finding identity by realizing boundaries, knowing who we are and who we aren't, what is ours and what isn't.

Tzimtzum - contraction

Havdala of second day and hiding of the Ohr Haganuz allows for kedusha, brings Olam Hazeh closer to Olam Haba than it was previously

We cannot take anything from this wold or from someone else; all we can do is share and be in relationship with

We discover our identity by how we relate to the people and things outside ourselves; otherwise we are being solipsistic and living in fantasy

Arayot - trying to take our identity from others and acting genrically