In the commercial airlines, at takeoff the flight attendants instruct passengers in the use of oxygen masks, reminding them to secure their own masks before assisting others. In the same way, to be effective spiritual warriors we must protect ourselves first. Otherwise we are of no use to anyone. The greatest protection of all comes from our unconditional, unmotivated, uninterrupted devotional service. Such service opens us up to a flow of divine love and protection in all circumstances.
Reference: Spiritual Warrior III: Solace for the Heart in Difficult Times, Chapter 8 – How To Strengthen Ourselves