Here is a quote about mindfulness:
“The whole question of Mindfulness or Awareness relates to the fifth of the five Buddhist ethical precepts. In Buddhism, being aware is a precept that we take upon ourselves. As Buddhists, we undertake to cultivate awareness. Awareness is a matter of ethics, it’s a matter of morality. Indeed, it is awareness itself that makes morality possible”
N.B. the precept referred to is ‘the undertaking to abstain from taking intoxicants’ or, in its positive form, ‘with mindfulness clear and radiant I purify the mind’.
The quote is by Kamalashila and this is the link to the piece of writing on his website where the quote is from: