To cultivate a quiet mind, continuously observe the babble of thought in the head. Notice the repetition and negativity. See how the aim of these thoughts is to trigger an emotional response, how they parade their own importance. Dispassionate attention slows the mind. The space between thoughts expands.
The human body is 99.999999999 percent empty space. Likewise, the cosmos is 99.999999999 percent empty space. Perhaps you have noticed what happens when we look up, when we notice space. The mind stops.