Hammer every thought in your mind thinking of how to serve Krishna.
We can get rid of the impurities of the heart by turning our consciousness towards Krishna. With mind we can think of Krishna and project our consciousness towards Him.
If we are not striving to improve and go forward, the current of this world will force us to go backward…like swimming upstream in a river.
Drink more and you become a drunkard. Similarly chant more and you become a perfect chanter.