Inner Sensitivity - In Gita Verse 3.37 The Supreme Personality of Godhead said: It is lust only, Arjuna, which is born of contact with the material mode of passion and later transformed into wrath, and which is the all-devouring sinful enemy of this world.
Carefully read what Krishna says - what you are saying is lust, which is nothing but your unconsciousness. When you are self-unconscious at that time you are in anger, hatred etc.
Krishna is giving direction to Arjuna that same war if it is fought with self-consciousness you will be able to Fight Without Enmity and with self-unconsciousness it will be from anger, hatred etc. You will enter into chain reactions with others, which is sinful. He is not talking about sin or virtue he is just whispering regarding his self-unconsciousness. Because of this he become lustful for the life, attached towards the life, forgot the eternity of life.
Krishna’s this verse I will like you to practice by following small technique as follows:
Feel the Presence of Existence:
This technique is based on inner sensitivity. First grow in sensitivity. Just close your doors, make the room dark, and light a small candle. Sit near the candle with a very loving attitude – rather, with a prayerful attitude.... Take a bath, throw cold water on your eyes, then sit in a very prayerful mood before the candle. Look at it and forget everything else. Just look at the small candle – the flame and the candle. Go on looking at it. After five minutes you will feel that many things are changing in the candle. They are not changing in the candle, remember; your eyes are changing.
With a loving attitude, with the whole world closed out, with total concentration, with a feeling heart, just go on looking at the candle and the flame. Then you will discover new colors around the flame, new shades which you were never aware were there. They are there; the whole rainbow is there. Wherever light is, the rainbow is there because light is all color. You need a subtle sensitivity. Just feel it and go on looking at it. Even if tears start flowing, go on looking at it. Those tears will help your eyes to be more fresh....
Sensitivity must grow. Your every sense must become more alive. Then you can experiment with this technique.
Feel the cosmos as a translucent ever-living presence.
Everywhere light is – in many, many shapes, forms, light is happening everywhere.
Look at it! And everywhere light is because the whole phenomenon is based on the foundation of light. Look at a leaf or a flower or a rock, and sooner or later you will feel rays coming out of it. Just wait patiently. Don't be in a hurry because nothing is revealed when you are in a hurry. In a hurry you are dull.
Wait silently with anything, and you will discover a new phenomenon which was always there, but of which you were not alert – not aware of it.... Your mind will become completely silent as you feel the presence of the ever-living existence. You will be just a part in it, just a note in the great symphony. No burden, no tension...the drop has fallen into the ocean. But great imagination will be needed in the beginning, and the sensitivity training will be helpful....
All these techniques also change your body chemistry. If you feel the whole world as filled with life, light, then you are changing your body chemistry. And this is a chain reaction. When your body chemistry changes, you can look at the world and it will look more alive. And if it looks more alive, your body chemistry will change again, and then it becomes a chain.
Even science has proved that when you are angry your bio-chemistry is different then when you are silent. They also says that when you are angry focus on breath and you will be calm down. They know that as soon as you focus on the breath your bio-chemistry changes.
By the above technique you will be able to see the difference in your approach towards similar circumstances. Once you have your own experience then it will be very easy for you to understand what Krishna says that the same war will be different if it is fought with self-consciousness and self-unconsciousness.