Principle of life.......

तस्मद असकतः सत्तम करयम कर्मा समाचारा 

असक्तो हय अचारन कर्मा परम् अपनोति पुरुषा ||

(tasmad asaktah satatam karyam karma samacara 

asakto hy acaran karma param apnoti purusah)

Therefore, without being attached to the fruits of activities, one should act as a matter of duty; for by working without attachment, one attains the Supreme satisfaction........