A colleague wrote the following to me :

> 
> I am making a conscious endeavor to clear my mind off trivial thoughts. 
> 
> 
> 

Though I read and understood the meaning, what rang a bell was the usage of *off*.

I have searched online and it appears to me that *all of the below are correct*:

> 
> * I am making a conscious endeavor to clear my mind **off** trivial thoughts
> * I am making a conscious endeavor to clear my mind **of** trivial thoughts
> * I am making a conscious endeavor to clear my mind **off of** trivial thoughts.
> 
> 
> 

Please correct me!