"Mindfulness vs. Concentration
Some people do not know the difference between "mindfulness" and "concentration." They concentrate on what they're doing, thinking that is being mindful. . . . We can concentrate on what we are doing, but if we are not mindful at the same time, with the ability to reflect on the moment, then if somebody interferes with our concentration, we may blow up, get carried away by anger at being frustrated. If we are mindful, we are aware of the tendency to first concentrate and then to feel anger when something interferes with that concentration. With mindfulness we can concentrate when it is appropriate to do so and not concentrate when it is appropriate not to do so.
-- Ajahn Sumedho, in Teachings of a Buddhist Monk"
Food for thought?