The moment we are peaceful and tranquil, we should try to acquire a wholesome state of mind by taking note of the present, thereby helping ourselves to still and gain one-pointedness of mind.
The present sense object can control mindfulness. It can also eliminate Suffering which belongs to the past and future. When our mind does not have impulses and emotions from the past and future, we have put a stop to it by concentrating on the present. But whenever we are absent-minded, there will be past and future, impulse and emotions. Remorse and distraction will also appear. Therefore we must train our mind to dwell in the present and know what we are doing.