As a goldsmith purifies the dross of his metal by repeatedly putting it into the fire with very great efforts of his own, similarly Individual Soul succeeds in purifying himself by his course through hundreds of births. Some one may be seen to purify himself in only one life by great efforts.
यथा हिरण्यकर्ता वै रूप्यमग्नौ विशोधयेत्। बहुशोऽतिप्रयत्नेन महताऽऽत्मकृतेन ह॥ तद्वज्जातिशतैर्जीवः शुद्ध्यतेऽनेन कर्मणा। यत्नेन महता चैवाप्येकजातौ विशुद्ध्यते॥