Krishna says, "Those who die with a predominance of 𝙨𝙖𝙩𝙫𝙖 𝙜𝙪𝙣𝙖 attain to the taintless worlds of the knowers of the supreme (14.14). One who meets death in 𝙧𝙖𝙟𝙖𝙨 is then born amongst those attached to action. Dying in 𝙩𝙖𝙢𝙖𝙨 𝙜𝙪𝙣𝙖 , one is born in the wombs of the deluded" (14.15). Krishna earlier explained about life-death-life where HE said that one would reach HIM when one remembers HIM at the time of death but cautioned that what one practices during one's lifetime determines what happens at their death (8.5 and 8.6). This indicates that the transition from life to death to life is a smooth one without any last minute surprises. If someone has a 𝙨𝙖𝙩𝙫𝙖 𝙜𝙪𝙣𝙖 dominant life, then the transition would be through 𝙨𝙖𝙩𝙫𝙖 only. The same is the case with 𝙧𝙖𝙟𝙖𝙨 and 𝙩𝙖𝙢𝙖𝙨 𝙜𝙪𝙣𝙖𝙨 .
Krishna describes various 𝙠𝙖𝙧𝙢𝙖𝙥𝙝𝙖𝙡 (fruits of action) these three 𝙜𝙪𝙣𝙖𝙨 bestow and says, "The fruit of 𝙨𝙖𝙩𝙫𝙞𝙠 is harmony and purity. The fruit of 𝙧𝙖𝙟𝙖𝙨 is sorrow. The fruit of 𝙩𝙖𝙢𝙖𝙨𝙞𝙘 actions is ignorance (14.16). Knowledge arises from 𝙨𝙖𝙩𝙫𝙖 ; greed from 𝙧𝙖𝙟𝙖𝙨 ; delusion and ignorance from 𝙩𝙖𝙢𝙖𝙨 (14.17). Those established in 𝙨𝙖𝙩𝙫𝙖 move upwards; established in 𝙧𝙖𝙟𝙖𝙨 dwell in the middle; those in 𝙩𝙖𝙢𝙖𝙨 go downwards" (14.18). An example of reading a book will help us understand 𝙠𝙖𝙧𝙢𝙖𝙥𝙝𝙖𝙡 in the context of 𝙜𝙪𝙣𝙖𝙨. When we are dominated by 𝙨𝙖𝙩𝙫𝙖 𝙜𝙪𝙣𝙖 , we read a book to attain knowledge and understanding. While in 𝙧𝙖𝙟𝙤 𝙜𝙪𝙣𝙖 , we read it to get marks leading to tension. In 𝙩𝙖𝙢𝙤 𝙜𝙪𝙣𝙖 we will fall asleep while reading a book.
A point to be noted is that each 𝙜𝙪𝙣𝙖 binds the 𝙖𝙩𝙢𝙖 to the physical body in its own way. The aforementioned verses give glimpses of various aspects of life based on the dominant 𝙜𝙪𝙣𝙖 in us during our lifetimes.