Material sense gratification, sinful activity kills the propensity to serve Krishna.
Every living being is anxious for full freedom because that is his transcendental nature. And this freedom is obtained only through the transcendental service of the Lord.
Srimad Bhagavatam 1.6.37,
Hammer every thought in your mind thinking of how to serve Krishna.
As soon as we get to know the Absolute Truth, we should become fixed in it. Instead of wasting a single moment of time left, we should be engaged in serving Sri Hari.
Lakshmi, the goddess of fortune, is called chanchal. Use it in worship of Lord Krishna.
To use mind in thinking of Krishna is as equivalent as to engage body in the service of Krishna.