From the point of view of time, we say “impermanence,” and from the point of view of space, we say “nonself.” Things cannot remain themselves for two consecutive moments, therefore, there is nothing that can be called a permanent “self.” Before you entered this room, you were different physically and mentally. Looking deeply at impermanence, you see nonself. Looking deeply at nonself, you see impermanence. We cannot say, “I can accept impermanence, but nonself is too difficult.” They are the same.