Patanjali Yoga Sutra 1.17

Sanskrit Sutra

वितर्कविचारानन्दास्मितानुगमात् सम्प्रज्ञातः॥१७॥

Swami Vivekananda's translation

The concentration called right knowledge is that which is followed by reasoning, discrimination, bliss, unqualified egoism.

Chapter link: Yoga Sutra Chapter 1