Bhagavad Gita Chapter 1 Sloka 24 (1.24)

ಸಂಜಯ ಉವಾಚ ।
ಏವಮುಕ್ತೋ ಹೃಷೀಕೇಶೋ ಗುಡಾಕೇಶೇನ ಭಾರತ ।
ಸೇನಯೋರುಭಯೋರ್ಮಧ್ಯೇ ಸ್ಥಾಪಯಿತ್ವಾ ರಥೋತ್ತಮಮ್ ॥೨೪॥
saṃjaya uvāca |
evamukto hṛṣīkeśo guḍākeśena bhārata |
senayorubhayormadhye sthāpayitvā rathottamam ||24||
Sloka 1:24
Gist of the sloka:
Sanjaya said
O King of the Bharatha dynasty, hearing the words of Gudakesha, Lord Hrishikesha stopped his great chariot in between the two armies.
Explanation:
Sanjaya continuing his commentary to Emperor Dhitrarastra, informed him that Lord of Senses [Hrishikesha] stopped the chariot in between the two armies. Arjuna is called Gudakesha as one who had conquered sleep.
Ego, overconfidence etc., are all mental states of a person. Lord Krishna being the lord of the senses, starts applying psychotherapy to Arjuna; to remove the ego and overconfidence in Arjuna. Gita happens to be the first book of Psychology in the world.