"I will give an analogy, in order for you to understand where the distorted conceptions of things stem from. For example, I give to someone a walnut and tell him to do research on it. Someone will do research on its taste, he will try the external green shell, he will bite it and will throw it away. I give the walnut to another person, he, [being] quite sensible already, peels off its external green shell, but when he tries the second shell he breaks his teeth, and also throws it away. I give the walnut to a third person, he, however, [being] even more sensible, peels off the external shell, breaks the hard nutshell with a stone, takes out the kernel and eats it. If we gather these three together and ask them what [sort of thing] a walnut is, one will say that the walnut is an astringent, pungent and poisonous fruit; the second - that it is a hard fruit that breaks people's teeth, the third - that it is something delicious and pleasant. This analogy can be adapted to our errors: all things in the world are wrapped in shells, and if we do not have enough knowledge, we will not find the essence. Food is necessary for the body, but also necessary is food for the mind and the soul; that is, we have to eat in two ways. And when we say that it is not good for a man to overeat, we understand that the body, the mind and the soul have to be equally fed. It is a whole triple circle, which forms the man. This is why those three people who pronounced themselves on the walnut are not sufficiently clever. The one who ate the walnut thinks he is the cleverest. No! I give the walnut to a fourth person, he takes it, but instead of eating it, plants it and in 10 or 15 years this single walnut gives thousands of walnuts. So, we have four categories of people in the world who philosophize: some say: "The world is no good, lecherous, it is not worth living"; others say: "In it [the world] egoism rules, it cannot be worse"; the third: "The world is good, pleasant"; they are closer to the truth. And who are the fourth? Those who have entered the Divine school and have started studying i.e. started planting the good things. The best conception for man is to know that the Earth is a Divine school in which he is set to study, to learn to peel off the upper and the lower shell of the walnut, and not to eat the walnut but to plant it..."