Lord Krishna talks about the traits of Atma

नासतो विद्यतॆ भावो नाभावो विद्यते सतः
उभयोरपि दृष्टो अंतस्त्वनयोस्तत्वदर्शिभिः
अविनाशि तु तद्विद्धि येन सर्वमिदम् ततम्
विनाशमव्ययस्यास्य न कश्चित्कर्तुमर्हति
अंतवंत इमे देहा नित्यस्योक्ताः शरीरिणः
अनाशिनो अप्रमेयस्य तस्माद्युध्यस्व भारत
य येनम् वेत्ति हंतारम् यश्चैनम् मन्यते हतम्
उभौ तौ न विजानीतो नायं हंति न हन्यतॆ

naasatO vidyatE bhaavO naabhaavO vidyatE sataha
ubhayOrapi dRuShtO antastwanyOstatwadarshibhihi
aviniaashi tu tadviddhi yena tashchitkartumarhati
antavanta imE dEhaa nityasyOktaaha shareeriNaha
anaashinO apramEyasya tasmaadyudhyaswa bhaarata
ya yenam vEtti hantaaram yashcainam manyatE hatam
ubhou tou na vijaaneetO naayam hanti na hanyatE

Shloka Meaning:

The untrue doesn’t tell the feelings, the non-feelings doesn’t tell the truth

If seen between the two the end result would be a philosophical visualization

Understand that this, which is everywhere, cannot be destroyable

This, which cannot be expensed, one probably has the ability to destroy

After the end of stay in one form, taking another form is its routine

This is cannot be destroyed, immeasurable and hence you need to fight bhaaratha

It should be learnt that this cannot be killed nor one can think of killing it

If you couldn’t understand the two, one cannot kill or get killed by this.

These are the famous preaching lines from the Lord Krishna in his Bhagavadgita, which explains how emotions and anything else doesn't work, if one understands that the atma is present everywhere and it remains forever not destroyed and immeasurable. He adds that after completion of all its tasks in one form, the atma moves to another form to assume its fresh duties.