The finiteness to you has come to you only because of your identification with your physicality.

你的有限性只是因为你认同你的肉体。

And apparently this was as his mother was passing away and he was very aware of the finiteness of life and he was kind of looking at his own youth.

显然， 当时他的母亲即将去世，他深知生命的有限性，正在回顾自己的青春。