There is a part of Zen teachers (Joko Beck, Bayda e.t.c.)that emphasize the need of labelling thoughts during Zazen practice.
By labelling I mean that when you realize that you're thinking, you actually repeat the very same thought within.its like having a parrot on your shoulder that repeats what you think. The idea is that labelling enables us to clarify more efficiently the fabrications of our minds better than just merely notice the fact that we are thinking and return to awareness. It seems a bit mechanical and mental reproach.
If you like to share some opinions about it with me .

Gassho George.