A is for Acceptance
Acceptance is almost a synonym for mindfulness. In Mindfulness A to Z, I put it this way:
When we are mindful, when we give our full attention to whatever is happening now, and can do so without the usual storytelling, pushing, pulling, and judgment, we arrive at acceptance. But it is rare that we give our full attention to what is happening now. We give partial attention; the rest of our attention is somewhere else. We are easily distracted.
Acceptance is coming to terms with reality as it is in this moment. First we must apprehend that reality with attention. Then, of course, we can take steps to change that reality in ways that are more consistent with our goals, values, and preferences. Acceptance, then is not a passive resignation but the wisdom of not fighting against what is so and saving that energy to act with more intention in the world.