In the article, “The Nation,” Baal HaSulam writes that a person differs from an animal in that animals completely rely on nature. Animals cannot adapt nature to themselves. In contrast, human beings are endowed with the power of thought, and without having to rely on nature, can, for example, instead of waiting for a chicken to hatch eggs, invent an incubator to perform the job of hatching eggs.
In a similar fashion, a person always strives to better his state, without placing himself under the blows of nature. A person attempts to find the most comfortable means of achieving his goals using the least effort to get results as quickly as possible and with the least suffering.
For people aspiring for the goal of spirituality, the science of Kabbalah serves as an “incubator” helping us speed up our spiritual development without waiting for it to occur in a severe natural way, which is both lengthy and painful. The goal of our spiritual development is to give rise to a sensation of an independent (free) equivalence to the Creator. The spiritual “incubator” for people needs to be multilayered, so that each person can find his place in it and feel as though he is in the arms of his caring mother. Then he will receive beneficial “nourishment,” which will gradually develop and raise him.