4.39 Sraddhavan, the man who has faith; labhate, attains; jnanam, Knowledge. Even when one has faith, he may be indolent. Therefore the Lord says, tatparah, who is diligent, steadfast in the service of the teacher, etc., which are the means of attaining Knowledge. Even when one has faith and is diligent, one may not have control over the organs. Hence the Lord says, samyata-indriyah, who has control over the organs-he whose organs (indriyani) have been withdrawn (samyata) from objects. He who is such, who is full of faith, diligent, and has control over the organs, does surely attain Knowledge. However, prostrations etc., which are external, are not invariably fruitful, for there is scope for dissimulation faith etc. But this is not so in the case of one possessing faith etc. Hence they are the unfailing means of acquiring Knowledge. What, again, will result from gaining Knowledge? This is being answered: Labdhva, achieving; jnanam, Knowledge; adhigacchati, one attains; acirena, soon indeed; param, supreme; santim, Peace, supreme detachment called Liberation. That Liberation soon follows from full Knowledge is a fact well ascertained from all the scriptures and reasoning. One should not entertain any doubt in this matter. For doubt is the most vicious thing. Why? The answer is being stated:

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4.39 The man who has faith, is diligent and has control over the organs, attains Knowledge. Achieving Knowledge, one soon attains supreme Peace.