yaḥ śāstra-vidhim utsṛjya
yaḥ śāstra-vidhim utsṛjya vartate kāma-cārataḥ |
na sa siddhim avāpnoti na sukhaṁ na parāṁ gatim ||
(Śrīmad Bhagavad-gītā: 16.23)
“One who rejects the injunctions of śāstra and remains engaged in wilful behavior attains neither success, nor happiness, nor the supreme destination.”