The author is inviting us to be radically, absolutely still prior to seeking happiness, God or any kind of fulfillment for that matter. Is stillness then some sort of ideal state to be achieved as a means to an end? This is what the word ' cultivate' is generally understood to mean. It is not what I understand the author to actually say but rather that stillness is our true nature, not a state to be achieved but a state that naturally emerges once we stop seeking. Neither is he saying how to still the mind, indicating any sort of practice. What he is adamantly saying is just let go the mind, let it be still. Just do it then see what happens. The practice is: Just do it! At least this is how I interpret this brief passage that doesn't say much about the relationship between stillness and perception but just invites us to try out being radically, absolutely still... for a change. Thank you Gangaji.