Before you sit Zazen your life exists in time, you pick it up, you put yourself in order, you come to sit, and you understand that your sitting will be of a particular duration and when that sitting finishes then you can resume the form of you life.
So when your like that, the ‘I’ that is you is folded up, sufficiently small to fit within the space of the self. However when you practice Zazen that ‘I’ unfolds and it unfolds to include the whole world

Adapted from Kusen No. 294 given on 4rth July 2020