Bhagavad Gita 5.6 Chapter 5, Verse 6

संन्यासस्तु महाबाहो दुःखमाप्तुमयोगतः ।
योगयुक्तो मुनिर्ब्रह्म नचिरेणाधिगच्छति ॥५.६॥

saṃnyāsastu mahābāho duḥkhamāptumayogataḥ
yogayukto munirbrahma nacireṇādhigacchati

Meaning

But renunciation, O mighty-armed, is hard to attain without the yoga of action. The sage devoted to selfless action soon reaches Brahman.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 5.6 (Chapter 5, The Yoga of Renunciation (Karma Sannyasa Yoga), Verse 6)