"Mindfulness, though so highly praised and capable of such great achievements, is not at all a "mystical" state, beyond the ken and reach of the average person. It is, on the contrary, something quite simple and common, and very familiar to us."
--
Source : Nyanaponika Thera (2005). “The Heart of Buddhist Meditation: Satipaṭṭhāna : a Handbook of Mental Training Based on the Buddha's Way of Mindfulness, with an Anthology of Relevant Texts Translated from the Pali and Sanskrit”, p.25, Buddhist Publication Society