Upanishads on Repentance

It was not conceit which led Nachiketas to consider his own standing and importance. He was weighing his value as a son and pupil in order to be able to judge whether or not he had merit enough to prove a worthy gift. Although he realized that his father's harsh reply was only the expression of a momentary outburst of anger; yet he believed that greater harm might befall his father, if his word was not kept. Therefore he sought to strengthen his father's resolution by reminding him of the transitory condition of life. He said:

He who has not turned away from evil conduct, whose senses are uncontrolled, who is not tranquil, whose mind is not at rest, he can never attain this Atman even by knowledge.

This is the eternal call of the wise: Awake from the slumber of ignorance! Arise and seek out those who know the Truth, because only those who have direct vision of Truth are capable of teaching It. Invoke their blessing with a humble spirit and seek to be instructed by them. The path is very difficult to tread. No thoughtless or lethargic person can safely travel on it. One must be strong, wakeful and persevering.

When all the ties of the heart are cut asunder here, then the mortal becomes immortal. Such is the teaching.