Kaṭha Upaniṣad 140

140

yas tv avijñānavān bhavaty amanaskaḥ sadāśuciḥ /
na sa tat padam āpnoti saṃsāraṃ cādhigacchati ///1,3.7 //

7. But he, whose intellect has no discrimination and whose thind is not under control and who is always unclean, does not reach that goal and falls into Samsara.