You do not go out into the street in your underwear, although usually you are wearing underwear. The underwear is not visible but it is there all the time. It is the same with concepts. They are there. They underlie practical things we do- even when we are not conscious of them.
Edward de BonoYou can analyse the past, but you need to design the future. That is the difference between suffering the future and enjoying it.
Edward de Bono