Possibly related topics but from the Theravada tradition:
- What is the difference between 'compassion' and 'pity'?
- What is right gifting?
- How are 'conceit' and 'identity-view' not the same?
I'm not sure what "negative thoughts" are -- though I know the term is used in pop psychology -- which teaches or uses "negative" as a synonym of "defeatist" ...
a person who expects or is excessively ready to accept failure
... and perhaps also as a symptom of stress and depression and conflict (and maybe loss of focus or "unwise attention").
The phrase is, literally or grammatically, negative ("nothing" ... "nor" ... "no") -- so it is "negative", but beneficially so, in the sense that it negates the arising of unskilful mental states like "conceit" etc.