The mind should be fixed in self. We are self and Krsna is also self. So, just like if you fix up your eyes on the sun, then you can see the sun and yourself also.
Sometimes in dense darkness we cannot see ourself also. That you have experienced. So I cannot see my body in dense darkness. Although body is with me, I am the body or I am whatever I am, I cannot see myself.
So if you are in the sunshine, sunlight, then you see the sun as well as yourself. Therefore to see the self means first of all see the Supreme Self. The Supreme Self is Krsna.
In the Vedas it is said, Kathopanisad, nityo nityanam cetanas cetananam. The Supreme Self is the chief eternal of all eternals. He is the chief living being of all living beings.
So this Krsna consciousness movement means to fix up in self.
If you fix up your mind in Krsna, then you can fix up your mind in everything.
If you take care of your stomach, then you take care of all the bodily limbs. If your stomach is supplied nice nutritious food, the stomach is cleared of all disturbances then you keep good health.
If you pour water in the root of the tree, then you take care of all the branches, leaves, flowers, twigs, everything, automatically.
So if you take care of Krsna then you do the best service to all others. Automatically.
- Srila Prabhupada