Sri Aurobindo
Letters on Himself and the Ashram
The Complete Works of Sri Aurobindo. Volume 35
Mantras and Messages
Use of a Mantra in Special Circumstances
This is not a case of ordinary madness, but, as your brother himself feels, an attack of evil forces. When the light descended into him, there was something in his brain that was not prepared or able to bear the descent and this gave the opportunity for the attack and the overthrow of the equilibrium.
It may be possible to set matters right without any personal contact. He should repeat as a mantram the words contained in the enclosed paper (which he should not reveal to others) after concentrating on the sign above it. He should repeat three times a day (the three Sandhyas), twelve times in all, and also whenever attacked.
Information should be sent from time to time about his condition.