The document discusses mindfulness and meditation. It explains that mindfulness involves controlling one's attention by focusing on the present moment rather than thoughts, and attending to the space between thoughts. Meditation trains the "attentional muscles" by allowing thoughts to arise without attachment or reaction. This helps people dissolve boundaries of thought-created time and space, and enter a state of presence and spaciousness. Mindfulness is described as simple - it involves paying attention to sensations, the breath, and bodily awareness in the current moment.