There is no effort that we can make to still ourselves. True stillness comes naturally from moments of solitude where we allow our minds to settle. Just as water seeks its own level, the mind will gravitate toward the holy. Muddy water will become clear if allowed to stand undisturbed, and so too will the mind become clear if it is allowed to be still.
Or the sower sowing in the fields, or the harvester harvesting,
I saw there, too, O life and death, your analogies;
(Life, life is the tillage, and Death is the harvest according.)