Sadhana -- a battlefied

Sadhana is a battlefield. You have to be vigilant. Don't take delivery of wrong beliefs and don't identify with the incoming thoughts that will give you pain and suffering. But if these things start happening to you, fight back by affirming, 'I am the Self; I am the Self; I am the Self;'.
These affirmations will lessen the power of the 'I am the body' arrows and eventually they will armour-plate you so successfully, the 'I am the body' thoughts that come your way will no longer have the power to touch you, affect you or make you suffer.

Annamalai Swami p33, Final Talks.