Contrary thoughts and emotions such as those of violence – whether done, caused to be done, or even approved of – indeed, any thought originating in desire, anger or delusion, whether mild medium or intense – do all result in suffering. Neutralize such a state through its opposite.
When the mind loses all desire for objects seen or heard about, it acquires a state of utter desirelessness which is called dispassion.
The persistent practice of discriminative knowledge is the means to liberation.
Austerities destroy impurities; and with the ensuing purification of the body and sense organs, physical and mental powers awaken.
Source – Yoga Sutras The Means to Liberation By Dennis Hill