Verse
क्लेशोऽधिकतरस्तेषाम् अव्यक्तासक्तचेतसाम् ॥अव्यक्ताहि गतिर्दुःखं देहवद्भिरवाप्यते ॥
The difficulty of those who devote themselves to the search of the unmanifest Brahman is greater; it is a thing to which embodied souls can only arrive by a constant mortification, a suffering of all the repressed members, a stern difficulty and anguish of the nature.
Gītā 12·5