Bhagavad Gita

ಮಾತ್ರಾಸ್ಪರ್ಶಾಸ್ತು ಕೌಂತೇಯ ಶೀತೋಷ್ಣಸುಖದುಃಖದಾಃ ।
ಆಗಮಾಪಾಯಿನೋನಿತ್ಯಾಸ್ತಾಂಸ್ತಿತಿಕ್ಷಸ್ವ ಭಾರತ ॥೧೪॥
mātrāsparśāstu kauṃteya śītoṣṇasukhaduḥkhadāḥ |
āgamāpāyinonityāstāṃstitikṣasva bhārata ||14||

Gist of the sloka:
O Kauntaeya; it’s the senses which gives us the sense of hot and cold; happiness and sadness. These sensations changes and does not stay on forever. O Bharatha learn to tolerate them.
It’s through our senses that we feel, smell, touch and enjoy/suffer the various ups and downs like hot/cold, happiness/sadness etc., Similarly cold sensation in winter would cause grief whereas in summer it might cause pleasure.
These sense reactions are transitory and what feels good to one might mean exactly opposite to another person. Once the death of a near one happens the sadness is due to the fact that we can no longer sense them in their physical bodies to which we have got used to. We no longer can see, talk, sit down with them etc., That loss of sensation causes the grief. No knowing what is in store for future after the death causes one to feel the fear – thereby death.
Higher the attachment towards the senses, greater is the loss. One does not feel this during sleep [without dream] as there is no sense of belonging to the gross body; even though the senses are still in touch with material things. This happens only during the state of wakefulness and dream.
Kauntaeya means son of Kunti. Kunti was known to have suffered various hardships throughout her life, but she never got disheartened. Rather she prayed to Lord to give her even more hardships as it would enable her to remember the Lord even more.
Being the son of such a illustrious mother, Arjuna was being reminded he needs to stay firm and stand up for the fight.
Bharatha indicating, Arjuna was a descended from the dynasty of Bharatha, was again being reminded that he needs to show more courage and stand up.