But practised for a long time, uninterruptedly and with reverence, it becomes firmly grounded
Practised for a long time, practised uninterruptedly, practised with reverence – carried through with austerity, with brahmacarya, with knowledge and with faith, in reverence, it becomes firmly grounded. The meaning is that the purpose is not suddenly overwhelmed by an extravertive saṃskāra.
But how does this become firm? He says, Practised for a long time, uninterruptedly. Unless it is for a long time, and unless it is uninterrupted, the practice does not become firmly grounded, and therefore both are mentioned. The practice is also specified as to be done with reverence. He explains that firmly grounded means that it is not overwhelmed by an extravertive saṃskāra suddenly in a rush.