4.39 After attaining knowledge through instruction in the manner described, he must have firm faith in it and the possibility of its development into ripe knowledge. He must be intent on it, i.e., his mind must be focussed thereupon. He must control his senses and keep them away from all their objects. Soon will he then reach the aforesaid state of maturity and obtain knowledge. Soon after attaining such kind of knowledge, he will reach supreme peace, i.e., he attains the supreme Nirvana (realisation of the self).