Anyone who does not know that he is suffering from disease is a fool. Although a person is fool number one, he poses himself as very intelligent. A fool cannot achieve the highest perfection of life. For example- A thief may know perfectly well that he may be arrested for his stealing, and he may actually even see a thief arrested by the police, yet he continues to steal. Experience is gathered by hearing and seeing. One who is less intelligent gathers experience by seeing, and one who is more intelligent gathers experience by hearing. When an intelligent person hears from the law books and sastras, or scriptures, that stealing is not good and hears that a thief is punished when arrested, he refrains from theft. A less intelligent person may first have to be arrested and punished for stealing to learn to stop stealing. However, a foolish man may have the experience of both hearing and seeing and may even be punished, but still he continues to steal. Even if such a person atones and is punished by the government, he will again commit theft as soon as he comes out of jail.
Ref >> Srila Prabhupada Vani