By making one's mind pure by a process of cleaning one enables oneself to receive intimations from higher planes of consciousness. The intimations inturn purify the mind like water falling from a height on a person giving certain amount of purity.

You can say that a person who receives intimations from the higher planes of consciousness gets his mind purified even as at the physical level waters falling from a height on to our body gives certain amount of purity.

The point is the grace is flowing from top to bottom in our meditation. The waters are supposed to be purifying.