When we lose the desire to change that means we are stagnant in Krishna Consciousness because we think we are perfect.
The worst thing that can happen to advanced devotees who are fixed in Krishna consciousness is that they will go back to the spiritual world. Thus, they are enabled by calamitous situations to go back to Krishna more quickly. It is a part of the process of devotion that from time to time everyone must be tested in various ways. When we take to devotional service we are declaring war against Maya. We are on a battlefield, engaged in our own battle of Kuruksetra. We shouldn’t read the Bhagavad-gita and think that it is merely some fascinating ancient history and philosophy. We should also understand that Arjuna is representing every person who is trying to take shelter of Krishna. Arjuna had to undergo bewilderment and serious choices, but Krishna was present to protect him.
Reference: Reflections On Sacred Teachings – Volume Six: Radha-Sunya: Missing Mercy, Chapter 2
Krishna consciousness at the bare minimum saves us from bad work and over and above that it gives us the richness of having the purpose of life.
Lecture on "Memories of my youth" – 27th OCT'06 – DXB
Real Krishna consciousness begins when one stops thinking how I shall be happy and starts thinking how Krishna shall be happy by my activities.
Lecture on "Understanding Krishna through Bhagavad Gita" – Salem – 8th Nov'06
Srila Prabhupada wasn't one of these vague "be nice" gurus of modern times. He made it clear that Krishna consciousness is not a branch of Hinduism, but the dharma of the jiva.
Lecture on "Srila Prabhupada's influence in India" – Bahrain – 25th OCT'06
How to understand everything in relationship with Krsna — this is Krishna consciousness. And non Krishna consciousness is not seeing Krishna in everything.
Lecture on SB 3.6.32 – About the Four Varnas – Vyasa Puja 2008 – 5th Jan'08 – Tirupati