Answer: The science of Kabbalah, along with other sciences, says that everything in the world is made up of the two opposing forces: plus-minus, north-south, pressure-vacuum, hot-cold, etc. All this is based on the two fundamental opposing forces: reception and bestowal. Perfection, life, consists of these two forces forming the third force, the middle line, where, in principle, all that exists is there. We see this in living organisms, in plants and animals. Before our time, we were also developing like animals, meaning instinctively, under the rule of the middle line.
But now we are reaching the next level of management when these two opposing forces emerge in us and we have to balance them on our own. This is the peculiarity of our time, of our development. Therefore, we have to see the world in harmony and have to bring this harmony into it by correctly combining the two opposing forces in ourselves: the force of reception (Aviut) and the property of bestowal (screen). We have to act in this manner.
From the Meal before the European Convention in Germany 3/23/13