what goes up must come down

Proverb

 * 1)  All trends will end; a rise (in the stock market, in a person's political or social influence, etc.) will be followed by a fall.
 * 2)  Substance induced euphoria is followed by withdrawal (often used to describe stimulants though same applies to many other drugs).

Synonyms
you win some, you lose some

Translations

 * Chinese:
 * Japanese:
 * Polish: ,