Those who have dedicated their lives to Krishna, Krishna remembers that this devotee has offered everything for my Sake. In this way Krishna is so Grateful.
Krishna can do anything. He can make the impossible endeavors of his devotees possible. Krishna can empower him because he is the supreme controller.
In the light of Krishna Consciousness, we can see everything as a prefect way. Krishna consciousness means to be aware of the fact how merciful Krishna is.
As you develop your love for Krishna he will inspire you to do things. When you become an instrument in Krishna’s hands, there is no way of knowing how much Krishna will do through you.
To recognize that He is the Supreme, we have to develop our mentality and that is why worshipping him is necessary because we are preparing our mentality to accept Him.
Devotee should only serve the Supreme Personality of Godhead. As Lord is the protector of His Devotees, he takes care of everything. Devotee has nothing to worry about.