The other variation would be that "God has a plan", which is ironic since, philosophically speaking if there is a God, it is impossible to know how He thinks or acts. Even answering if this statement is true or false would mean that we are Gods ourselves.

The correct version would be "God works in mysterious ways".

Also, "everything happens for a reason" is a truism in the sense that every action has a reaction, but otherwise if you replace "reason" with "purpose" it fails the falsifiability test.