Bhagwad Gita
Chapter 5, Verse 6
संन्यासस्तु महाबाहो दुःखमाप्तुमयोगतः।
योगयुक्तो मुनिर्ब्रह्म नचिरेणाधिगच्छति।।5.6।।
Unless one is engaged in the devotional service of the Lord, mere renunciation of activities cannot make one happy. The sages, purified by works of devotion, achieve the Supreme without delay.