The times they are a-changin'.
~ American Proverb [18871]

One of Bob Dylan's most recognized song lyrics, the phrase quickly spread throughout the American culture (or counter-culture as some might claim). It is the title song of Dylan's third album and first album of all original compositions.

The words are usually applied to political or societal situations that lack permanence. It was also applied to generational change.

"The order is rapidly fadin'
And the first one now will later be last
For the times they are a-changin'"