The Soul is fettered by its pristine acts. Fettered by acts done by it in one state. Indeed, it is led from one into another body by its owni acts which are of very powerful consequences.
कर्मणा बाध्यते रूपं कर्मणा चोपलभ्यते। कर्मणा नीयतेऽन्यत्र स्वकृतेन बलीयसा॥