Ignorance

When a headache comes on casually, you have to get rid of it by medicine.
Just as boils and other diseases of the body are cured by a doctor's treatment, sorrows which are the result of various difficulties can be overcome by sadhana.
This body itself is a disease. The root cause of it is ignorance. If for that ignorance the medicine called jnana is administered all inherent diseases will disappear at once.

~ Sri Ramana Maharshi

'Letters from Sri Ramanasramam';