Bhagavad Gita Verse 34, Chapter 3

indriyasyendriyasyaarthe raagadveshau vyavasthitau |
tayorna vashamaagacchettau hyaasya paripanthinau || 34 ||
 
Likes and dislikes for sense objects reside in the senses. One should not come under their sway, for they are highway robbers.
 
indriyasya : in the sense organs
indriyasya : in each and every
arthe : for the sense objects
raaga-dveshau : like and dislike
vyavasthitau : lie, reside, situated
tayoh : both
na : should not
vasham : under their control
aagacchet : one should not come
tau : both of them
hi : for
asya : in this
paripanthinau : highway robbers
 
Having explained that our inherent tendencies are the biggest obstacle in karmayoga, Shri Krishna points out their precise location. He says that the tendencies manifest as likes and dislikes for material objects. These tendencies reside in our senses: the eyes, ears, skin, tongue and nose.
 
First let's look at likes and dislikes. The only way we can truly understand the shape of our inherent tendencies is through a deep examination of our likes and dislikes. Every human being harbours likes and dislikes. It is so strange that two children having grown up in the exact same home and family environment reveal such different likes and dislikes, even as toddlers.
 
So where are the likes and dislikes stored? They reside in our sense organs. The tongue is attracted to the taste of fries, and is repelled by the taste of spinach. The eye likes a certain kind of form and is repelled by another and so on. In his commentary on the Gita, Sant Jnyaneshwar compares the sense organs to dangerous animals and asks : does one befriend a snake, or maintain the company of tigers?
 
So therefore, what is the solution? We should not come under the sway of likes and dislikes by being aware of them especially when they strike, by using our intellect to guide us, and by continually reminding ourself of the higher ideal we have set for ourselves in karmayoga. We should not let them create a roadblock in our path. Like an elephant that moves on its path even though dogs bark at it, we should keep likes and dislikes at bay and never lose sight of our path and goal.
 
The first chapter of the Gita provides the best example for this shloka. Arjuna loved warfare, but he did not like the Mahabhaarata war simply because his relatives were on the other side. Shri Krishna, representing the intellect, guided him towards the right path. Another example is when a doctor prescribes us bitter medicine - we may not like but we take it nevertheless.
 
Shri Krishna compares likes and dislikes to highway robbers who target travellers that are unprepared and not alert. The robbers will come out of nowhere, and distract travellers from their path. Similarly, the likes make us run towards them and dislikes make us run away, but ultimately both take us away from our path. By being constantly alert that likes and dislikes can arise, we can reduce their influence.

Bhagavad Gita Verse 19, Chapter 2

ya enam vetti hantaaram yachshainam manyate hatam |
ubhau tau na vijaanito naayam hanti na hanyate || 19 ||
 
A person who believes that it (the eternal essence) slays, and another who believes that it is slain, neither of these understands. It does not slay, nor is it slain.
 
yaha : that person who
enam : this (body dweller)
vetti : believes
hantaaram : slayer
yaha : that
cha : and
enam : this
manyate : believes
hatam: slain
ubhau : both
tau : those
na : do not
vijaanitaha : know
na ayam : this does not
hanti : slay
na hanyate : nor is slain
 
The "It" in this shloka and the following shlokas refers to the body-dweller. Here Shri Krishna addresses another concern that Arjuna had raised. Arjuna thought that that he will be held responsible for killing his kinsmen, which was something that was abhorrent to him. But Shri Krishna through this shloka advised him to use the logic or the perspective of the eternal essence. The eternal essence does not kill, nor does it die from someone else trying to kill it.
 
But how does this apply to us? We are not warriors, and it is rare that we will be put in the position of killing somebody. So there must be another interpretation.This shloka equates the act of slaying to performance of any action, and being slain to any change or modification. In other words, the eternal essence never performs any action, nor does it undergo any change or modification.
 
As an example, let's consider at the sun. Without the sun there will be no activity or life on this planet. There would be no plant life because plants use the sun's energy. There would be no animal or human life because both cannot survive without plants. But, does the sun perform any action pertaining to growing a plant or an animal? Does it get affected by all the changes happening on earth? It does not that that "I caused this forest to grow" or "I was impacted by this eclipse". It remains actionless and changeless.
 
The shloka goes on to say that one who thinks that the eternal essence acts or kills is not using viveka or discrimination, and that person does not have the correct understanding. The person is still thinking at the level of the material object, or in other words, the level of the un-real, and has still not learnt to discriminate between the two.
 
Footnotes
 
1. Verses 19 and 20 are almost verbatim taken from the Katha Upanishad.