In the beginning, our student only had feelings, only feelings, but now he is rational.Comparing several successive or simultaneous sensations produces judgments, and the resulting mixed or synthetic sensations we call ideas.It is the manner in which ideas are formed that gives the mind its character.The mind that obtains ideas from the real relationship of things is healthy, but the ideas that are obtained from the superficial relationship are superficial. Those who can see the real relationship have order in their minds, but those who cannot do it will be chaotic.He who fabricates imaginary relationships that do not actually exist is a madman, and he who does not observe any relationship at all is a fool.The difference between smart people and other people lies in the ability to compare ideas and discover relationships. "Nature has never deceived us, it is we who deceive us."