When the lens of the intellect becomes refined (clean), it is able to examine many things in detail and work like a microscope.
In the same way that a microscope is able to detect bacteria and the types of germ that cause particular types of disease, so too the intellect is able to use its microscopic capacity to detect those germs that cause emotional and spiritual illness inside the soul.
For example, it is able to examine and understand that the illness of anger comes from the germ of expectation; that the illness of possessiveness comes from the germ of insecurity; the illness of aggression, or forcefulness, comes from the germ of fear and that the illness of stress stems from the germs of worry, doubt and greed. If the germs are seen and understood, then the illness can be cured through the application of appropriate knowledge and meditation.
Meditation, in the form of focused silence, acts like a spiritual laser dissolving the acquired germs and emerging the original healing energies of the self, such as peace and self-respect.
Without this focused silence, it is difficult to remove the germs, even if they are seen and understood. The original innate energy of the soul (mentioned above) is needed for any permanent cure.