Bhagavad Gita Chapter 2, verses 47-48:
Aum
kar-ma-ne-eva-di-ka-ras-te
maa pal-eshu kadaa-cha-na
maa kar-ma-pala-hey-tur-bhur
maa te san-go ‘stwa-kar-ma-ni
yoga-sthah ku-ru kar-ma-ni
san-gam tyak-tsva danam-jaya
sid-dya-sid-yoh samo bhu-tva
sa-ma-tvam yoga uch-ya-te
Aum
Your sphere of influence is with your actions alone
But never in the fruits or results of your actions
Don’t let your motive to act be because of the fruits or results of your actions
But at the same time don’t become selfishly attached to inaction or laziness
When practicing yoga, perform your actions
Having abandoned attachment to worldly desires and wishes
And become equally content with success or failure
Yoga is said to be that state of equanimity or even-mindedness