Bhagwad Gita
Chapter 3, Verse 32
ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम्।
सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः।।3.32।।
But those who, out of envy, disregard these teachings and do not practice them regularly, are to be considered bereft of all knowledge, befooled, and doomed to ignorance and bondage.