We have to investigate nature in which we exist. Otherwise, we will not be at peace with this world, will not know how to obtain food, from what materials to make cloths. We have to study the phenomena of this world, and I would say, control them. To the extent a person masters the existing reality he can provide himself with all that he needs. The same applies in the spiritual world: as my body is unable to exist in this world without knowledge about it, so is my soul unable to exist in the spiritual world without knowledge the spiritual world. This knowledge can be given only by the science of Kabbalah.
Courtesy of http://www.youtube.com/watch?v=_vx1MNJhTpk