Bhagavatapurana 5.5.12

5.5.12

adhyātma-yogena vivikta-sevayā prāṇendriyātmābhijayena sadhryak /
sac-chraddhayā brahmacaryeṇa śaśvad asampramādena yamena vācām //

12. By studying the science of Atman, by living in seclusion, by subduing the breaths, the senses and the mind thoroughly; by absolute faith in the right, by strict celibacy, by being ever alert to do duties and by controlling speech (the tongue);