that which you hold holds you

She wondered how the moon, two hundred and thirty-nine thousand miles above the roof, could affect her as profoundly as it did. Being four times larger than the moon, the earth appeared to dominate. Caught in the earth’s gravitational web, the moon moved around the earth and could never get away. Yet, as any half-awake materialist well knows, that which you hold holds you. Neither could the earth escape the moon.