तत्र, मनःशरीराबाधकराणि शल्यानि; तेषामाहरणोपायो यन्त्राणि ||Su.Su.7/4
मनः-he rational faculty of the mind/Psychological
शल्यानि-Foreign body, Violence, Traumatizing, Pain
यन्त्राणि - Instruments
Meaning of the Shloka:
The one which causes the trouble/pain to mind and body can be called as Shalyas, and the means to remove those Shalyas are called as Yantras.