The basic idea is that every thought that we think had some causes and conditions that allowed it to arise.

Even the thoughts that we think are new, or innovative, are the result of cultural conditioning, influences, our upbringing etc…

If not even thoughts can be defined as “mine”, is there anything that I can call “mine?”

Good talk by Osho on this

Blissful Madness · Your Thoughts Are Not Yours

Related: Anatta (no-self) | Meditation