[单选题]The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.


Change is the most changeless thing in the universe. We need to accept all changes - welcome or unwelcome - with the understanding that nothing comes to stay, but only to pass. As two things can never occupy the same space at the same time, one change makes way for the next.

Change is （）