Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 52
Sanskrit:
करोति कर्माणि तप:सुनिष्ठितोनिवृत्तभोगस्तदपेक्षयाददत् ।पुनश्च भूयासमहं स्वराडितिप्रवृद्धतर्षो न सुखाय कल्पते ॥ ५२ ॥
ITRANS:
karoti karmāṇi tapaḥ-suniṣṭhitonivṛtta-bhogas tad-apekṣayādadatpunaś ca bhūyāsam ahaṁ sva-rāḍ itipravṛddha-tarṣo na sukhāya kalpate
Translation:
A king who desires even greater power than he already has strictly performs his duties, carefully practicing austerity and forgoing sense enjoyment. But he whose urges are so rampant, thinking “I am independent and supreme,” cannot attain happiness.