Soul substance (jīva dravya) is ubiquitous but unseen. Driving force within each one of us, it has been, since time immemorial, a subject matter of research by philosophers, religious leaders and laity. Still, ambiguity and misconceptions prevail as regard its real nature.
Âcârya Pujyapâda in Sarvârthasiddhi makes clear that sallekhanā is making the physical body and the internal passions emaciated by abandoning their sources gradually at the approach of death.