On Negative Thoughts…
Negative thoughts and emotions are violent, in that they cause injury to yourself and others, regardless of whether they are performed by you, done by others, or you permit them to be done.
They arise from greed, anger, or delusion regardless of whether they arise from mild, moderate, or excessive emotional intensity.
They result in endless misery and ignorance.
Therefore, when you consistently cultivate the OPPOSITE thoughts and emotions, the unwholesome tendencies are gradually destroyed.
-II, 34. Yoga Sutras of Patanjali





