Consciousness is originally pure, like water. But if we mix water with a certain color, it changes. Similarly, consciousness is pure, for the spirit soul is pure. But consciousness is changed according to the association of the material qualities.
Maya is so thorough, just like water, if there's one little hole, the water wil just find its way immediately to that hole. And the problem is our consciousness has so many holes.
Water is very clean. When it rains from the clouds it is very clean, but as soon as it drops on the ground it becomes muddy. So that muddiness has to be cleansed then water will come out again clean. Similarly, our consciousness is clean, but because it is contaminated with the muddy things of the material nature, it is cloudy.
We can get rid of the impurities of the heart by turning our consciousness towards Krishna. With mind we can think of Krishna and project our consciousness towards Him.
If you become conscious of Me, (Lord Krishna) you will pass over all the obstacles of conditioned life by My grace. If, however, you do not work in such consciousness, but act through false ego, not listening to Me, you will be lost.
Most people worship God as their order supplier. But Vrindavan consciousness is simply to give pleasure to Krishna and to not expect anything in return except the opportunity to serve. And when we chant the holy names with this spirit, Krishna reveals himself in full.