Q: Why do we need to increase the desire in the method of Kabbalah?
A: The wisdom of Kabbalah is a science about the universe and the system that controls it; it explains the way everything around us happens. No other system gives us the ability to lead, monitor and control the world, because they are all based on diminishing the ego, the desire to receive.
It takes a great will to receive to lead, because one can lead only if one has enormous desires, corrected, right desires, because our desires are the forces by which we influence the collective system of creation.
All other systems are based on the reduction of man to a lower degree, even as low as a plant. We are told to eat less, breathe less, move less, restrict ourselves, and live in monasteries.
The wisdom of Kabbalah, however, speaks about being a great egoist, about wanting to swallow the entire world, and after that, working with that desire and correcting it. Because of that, the wisdom of Kabbalah develops in you the ability to rule, guide, and lead. Other methods are built on the suppression of desires, and thus depress your ability to lead creation.