We are all human beings. As such, we are part of a big family: the human family. The pain of any human being will somehow affect the entire family.
The art of concentration is a continual letting go. We let go of what is inessential or distracting. We let go of a thought or a feeling, not because we are afraid of it or because we can’t bear to acknowledge it as a part of our experience; but, because it is UNNECESSARY.