यस्त्वविज्ञानवान्भवत्यमनस्कः सदाऽशुचिः । न स तत्पदमाप्नोति संसारं चाधिगच्छति ॥ ७॥

ॐ

English Translation

If the buddhi, being related to a distracted mind, loses its discrimination and therefore always remains impure, then the embodied soul never attains the goal, but enters into the round of births. 

ॐ

English Commentary

Now the text mentions the results produced by the driver (intelligence) who is unknowing, as above stated; the lord of the chariot, who does not know and who has not the mind under control and who is, therefore, always unclean, does not attain that immortal great goal already described, by reason of having such a driver. It is not alone that he does not attain that, but he reaches Samsâra marked by births and deaths.

Sri Shankaracharya