the be-all and end-all (of something)
idiomPart ofbe
the be-all and end-all (of something) — idiom
1. The most important or essential part of something.
1.idiom
Definition
The most important or essential part of something.
Example
Winning the championship is not the be-all and end-all of his career.
For many, money is the be-all and end-all of happiness.