This explains why it so frequently happens that, after a long course of learning and reading, we enter upon the world in our youth, partly with an artless ignorance of things, partly with wrong notions about them; so that our demeanor savors at one moment of a nervous anxiety, at another of a mistaken confidence. The reason of this is simply that our head is full of general ideas which we are now trying to turn to some use, but which we hardly ever apply rightly. This is the result of acting in direct opposition to the natural development of the mind by obtaining general ideas first, and particular observations last: it is putting the cart before the horse. Instead of developing the child's own faculties of discernment, and teaching it to judge and think for itself, the teacher uses all his energies to stuff its head full of the ready-made thoughts of other people. The mistaken views of life, which spring from a false application of general ideas, have afterwards to be corrected by long years of experience; and it is seldom that they are wholly corrected. This is why so few men of learning are possessed of common-sense, such as is often to be met with in people who have had no instruction at all. _To acquire a knowledge of the world_ might be defined as the aim of all education; and it follows from what I have said that special stress should be laid upon beginning to acquire this knowledge _at the right end_. As I have shown, this means, in the main, that the particular observation of a thing shall precede the general idea of it; further, that narrow and circumscribed ideas shall come before ideas of a wide range. It means, therefore, that the whole system of education shall follow in the steps that must have been taken by the ideas themselves in the course of their formation. But whenever any of these steps are skipped or left out, the instruction is defective, and the ideas obtained are false; and finally, a distorted view of the world arises, peculiar to the individual himself--a view such as almost everyone entertains for some time, and most men for as long as they live. No one can look into his own mind without seeing that it was only after reaching a very mature age, and in some cases when he least expected it, that he came to a right understanding or a clear view of many matters in his life, that, after all, were not very difficult or complicated. Up till then, they were points in his knowledge of the world which were still obscure, due to his having skipped some particular lesson in those early days of his education, whatever it may have been like--whether artificial and conventional, or of that natural kind which is based upon individual experience.