Loving service is the means to show our gratitude.
Satisfaction can be disturbed by our surroundings, but Krishna Consciousness can help us transcend everything.
To protect ourselves from Kali we have to be honest, sincere and should not keep ulterior motive-. Hence we became instruments of Maya. We should strive to live by the teachings that Srimad Bhagvatam has left with us.
We are eternal in nature; we are eternal souls and therefore something as artificial as death causes fear. When the eternal thinks it is temporary, that ignorance causes it so much anxiety, disturbance and fear.