BG 5.20

न प्रहृष्येत्प्रियं प्राप्य नोद्विजेत्प्राप्य चाप्रियम् ।
स्थिरबुद्धिरसंमूढो ब्रह्मविद्ब्रह्मणि स्थितः ॥२०॥

na prahṛṣyet priyaṁ prāpya
nodvijet prāpya cāpriyam
sthira-buddhir asammūḍho
brahma-vid brahmaṇi sthitaḥ

3 times this text was mentioned in purports to other texts: LBG(3)

na - never; prahṛṣyet - rejoices; priyam - the pleasant; prāpya - achieving; na - does not; udvijet - become agitated; prāpya - obtaining; ca - also; apriyam - the unpleasant; sthira-buddhiḥ - self-intelligent; asammūḍhaḥ - unbewildered; brahma-vit - one who knows the Supreme perfectly; brahmaṇi - in the transcendence; sthitaḥ - situated.

Text

A person who neither rejoices upon achieving something pleasant nor laments upon obtaining something unpleasant, who is self-intelligent, who is unbewildered, and who knows the science of God is already situated in transcendence.

Purport

The symptoms of the self-realized person are given herein. The ﬁrst symptom is that he is not illusioned by the false identiﬁcation of the body with his true self. He knows perfectly well that he is not this body but is the fragmental portion of the Supreme Personality of Godhead. He is therefore not joyful in achieving something, nor does he lament in losing anything which is related to his body. This steadiness of mind is called sthira-buddhi, or self-intelligence. He is therefore never bewildered by mistaking the gross body for the soul, nor does he accept the body as permanent and disregard the existence of the soul. This knowledge elevates him to the station of knowing the complete science of the Absolute Truth, namely Brahman, Paramātmā and Bhagavān. He thus knows his constitutional position perfectly well, without falsely trying to become one with the Supreme in all respects. This is called Brahman realization, or self-realization. Such steady consciousness is called Kṛṣṇa consciousness.

Bhagavad Gita As It Is.

Chapter 5: Karma-yoga — Action in Krishna Consciousness. Text 20

3 times this text was mentioned in purports to other texts: LBG(3)

A person who neither rejoices upon achieving something pleasant nor laments upon obtaining something unpleasant, who is self-intelligent, who is unbewildered, and who knows the science of God is already situated in transcendence.