Sincerity is the key....

Verse 1.2.33: Krishna, as paramatma sits in the heart is explained in this shloka.
We are actually making newer bodies for us everyday, especially if we are not Krishna conscious. Krishna is explaining that it is very difficult to explain the material nature.

Paramatma sitting in the heart, allows some actions and rejects some. Why paramatma rejects is that we might not deserve those reactions. He is the overseer and permitter.
He watches our actions and either permits them or rejects them. The gross material body is based on the conditions of the subtle mind, and the senses are created according to the desire of the living being. The Lord as Paramätmä helps the living being to get material happiness because the living being is helpless in all respects in obtaining what he desires.

This is what has been happening for time immemorial. Because Krishna is not there, our actions have reactions. It is deepening the feeling that we are this body and we are getting into the conditioning of doing it again and again.

Our have a subtle body, in close proximity of around 1 m with another body, we are being influenced by the other body. Unknowingly we are making newer bodies for us. Actually spirit soul has nothing to do with this body, it is just because of avidya we identify with all these bodily connections.

Happiness-distress-happiness-distress....continues.
So what should we do. There is no happiness in this world. It is so temporary.
So finally we come in touch with Krishna. In the association of devotees, we chant and serve. That cleanses us. Until we are sufficiently cleansed, we will not know for sure that we are not this body, we are spirit soul.

So we should be very very sincere. Why? Because only in the human beings, we are have this wonderful opportunity to understand. No other body will allow us this facility. Sincerity is the only way we can continue our quest to be Krishna Conscious.