Question:
Where do negative thoughts come from?
Response:
I assume you mean recurring, unbidden persistent negative thoughts. They arise from the unconscious thought patterns established by past habits. You can’t change them by trying to push them away or with will power. That is just the surface of the mind trying to control the depths of the mind. To change the thought patterns, you must go beyond the mind to pure consciousness, your true Self. That experience of your Being eventually dissolves those deep impressions and frees the mind from the past.
Love,
Deepak
https://www.deepakchopra.com/blog/article/5241