Pesachim 105: Shabbat Arrives When It Does, Like It or Not

A story of a meal where the diners need to determine whether Shabbat has begun. Which leads to a discussion about the fact that Shabbat establishes itself, and incurs a need to make kiddush - which is not the same thing as people actually creating the sanctity of Shabbat. Also, can you make up the Friday night kiddush during the day of Shabbat? Plus, the confidence and humility of R. Nachman bar Yitzchak.