One verse

Bhagavad Gita 2.56

2.56

दुःखेष्वनुद्विग्नमनाः सुखेषु विगतस्पृहः | वीतरागभयक्रोधः स्थितधीर्मुनिरुच्यते ||२-५६||

duḥkheṣvanudvignamanāḥ sukheṣu vigataspṛhaḥ . vītarāgabhayakrodhaḥ sthitadhīrmunirucyate ||2-56||

duḥkheṣu
in the threefold miseries
anudvigna-manāḥ
without being agitated in mind
sukheṣu
in happiness
vigata-spṛhaḥ
without being interested
vīta
free from
rāga
attachment
bhaya
fear
krodhaḥ
and anger
sthita-dhīḥ
whose mind is steady
muniḥ
a sage
ucyate
is called

One who is not disturbed in mind even amidst the threefold miseries or elated when there is happiness, and who is free from attachment, fear and anger, is called a sage of steady mind.