Nothing lasts forever.

From the Bible, Matthew 24:6-8 (King James Version):

And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet.
For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.
All these are the beginning of sorrows.