Bhagavad Gita 12.5 Chapter 12, Verse 5

क्लेशोऽधिकतरस्तेषामव्यक्तासक्तचेतसाम् ।
अव्यक्ता हि गतिर्दुःखं देहवद्भिरवाप्यते ॥१२.५॥

kleśo'dhikatarasteṣāmavyaktāsaktacetasām
avyaktā hi gatirduḥkhaṃ dehavadbhiravāpyate

Meaning

But the effort is greater for those whose minds are set on the unmanifest, for the path of the unmanifest is hard for embodied beings to travel.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 12.5 (Chapter 12, The Yoga of Devotion (Bhakti Yoga), Verse 5)