Planets

1. Jupiter and Venus are Brahmanas (learned). 
2. Sun and Mars are Kshatriyas (warriors). 
3. Moon and Mercury are Vaisyas (traders). 
4. Saturn is a Sudra (worker).

In this manner, we should understand varnas to show one’s basic nature rather than the caste of one’s family.

1. Learning and intelligence is the forte of the learned class. 
2. Bravery is the forte of the warrior class. 
3. Getting along with others well is the forte of the trader class. 
4. Hard work is the forte of the working class. 

https://journeytomoksha.wordpress.com/2012/12/10/the-real-caste-system/

http://www.mallstuffs.com/Blogs/BlogDetails.aspx?BlogId=99&BlogType=Spiritual&Topic=Vedas+Quotes+Against+Present+Caste+System 

Source

http://freeglobaluniversity.blogspot.com/search/label/Planets