Left to itself the mind wanders through all kinds of thoughts — including thoughts expressing anger, craving, depression, revenge, self-pity, etc. As we indulge in these kinds of thoughts we reinforce those emotions in our hearts and cause ourselves to suffer. Mostly these thoughts are about the past or future. The past no longer exists. The future is just a fantasy until it happens. The one moment we actually can experience — the present moment — is the one we seem most to avoid.
So in mindfulness we’re concerned with noticing what’s going on right now. That doesn’t mean we can no longer think about the past or future, but when we do so we do so mindfully, so that we’re aware that right now we’re thinking about the past or future.
Paying attention “non-judgmentally”
Mindfulness is an emotionally non-reactive state. We don’t judge that this experience is good and that one is bad. Or if we do make those judgements we simply notice them and let go of them. We don’t get upset because we’re experiencing something we don’t want to be experiencing or because we’re not experiencing what we would rather be experiencing. We simply accept whatever arises. We observe it mindfully. We notice it arising, passing through us, and ceasing to exist.
Whether it’s a pleasant experience or a painful experience we treat it the same way.
Cognitively, mindfulness is aware that certain experiences are pleasant and some are unpleasant, but on an emotional level we simply don’t react. We call this “equanimity” — stillness and balance of mind.