Bhagavad Gita Verse 47, Chapter 18

shreyansvadharmo vigunaha paradharmaatsvanushthataat |
svabhaavaniyatam karma kurvannaapnoti kilbisham || 47 ||
 
One's duty, though devoid of merits, is superior to another's duty well performed. Doing the duty prescribed for one's nature, one does not incur sin.
 
shreyan : superior
svadharmaha : one's duty
vigunaha : devoid of merits
paradharmaat : than another's duty
svanushthataat : well performed
svabhaavaniyatam : prescribed for per one’s nature
karma : duty
kurvann : doing
na : does not
aapnoti : incur
kilbisham : sin
 
We now focus on the subject of svadharma, which is the set of actions termed as duty. As we saw earlier, our duty can only be understood by conducting self analysis to understand what our mental makeup, what our varna is. Some of us may be well suited for starting businesses, whereas some of us may be better suited for the service sector. But it is quite common to get enchanted by another person’s occupation since it generates more money, since it has glamour and fame, and so on. How should we deal with this situation?
 
Shri Krishna says that we should stick to performing our svadharma, no matter how profitable or how glamourous other occupations seem like. In the short term, if we pick up another occupation, it may seem like we are doing a great job. But in the long run, we will fall into trouble. We will run into some problem or the other on account of not being suitable for someone else’s occupation. We also will deprive society from giving it the level of service possible if we had stuck with what we are good at.
 
Harbouring likes and dislikes towards actions, preferring someone else's occupation to ours, has the effect of strengthening the ego, and hence should be avoided. Furthermore, in karma yoga, we are only expected to perform our best actions, and to not worry about the result. By performing our svadharma, by doing the best we can, we automatically the fear of the consequence of our action, whether or not it will be a merit or a sin. To perform actions fearlessly is a blessing in itself.