Composure is an inner experience of what's arising, not dependent on our normal preferences and reactions. Sometimes called vipassana we’re aware subtle or strong currents, noticing and not reacting.
Considering the structures of the day we can release those that are not useful and direct them to discover citta and an inner balance, not just 'the next thing'.
Sati-mindfulness, or bearing in mind – is the third indriya. It is a powerful ally for liberation. With this we come out of old habits and find freshness, meaning, potency. You feel where your strength arises.