Mindfulness entails knowing what is happening in the present moment while it is happening. It is a training in how not to be lost in thoughts, opinions, and reactivity. It is also a training in how to see things as they really are, as opposed to seeing them through the often distorted lens of preconceived ideas and interpretations.
Fronsdal, Gil (2001). Issue at Hand (Kindle Locations 132-134). self. Kindle Edition.