I'm having a Boolean moment:
Some celebration is worship.
Some worship is celebration.
Not all worship is celebration.
Not all celebration is worship.
Neither is a subset or superset of the other.
Therefore, it cannot be said that celebration equals worship (not honestly anyway).
Here's a Venn diagram (celebration=a, worship=b).
![](http://edsitement.neh.gov/lesson_images/lesson364/Venn.gif)