Sri Aurobindo
Letters of Sri Aurobindo
3. The Mother and the Practice of the Integral Yoga
What people see around the Mother is first her aura, as it is called nowadays, and secondly the forces of Light that pour out from her when she concentrates, as she always does on the roof for instance. (Everybody has an aura – but in most it is weak and not very luminous, in the Mother’s aura there is the full play 
of lights and powers.) People do not see it usually because it is a subtle physical and not a gross material phenomenon. They can see only on two conditions, first if they develop sufficient subtle sight, secondly if the aura itself begins to become so strong that it affects the sheath of gross matter which conceals it. The Mother has certainly no idea of making people see it – it is of themselves that one after another, some 20 or 30 in the Asram, I believe, have come to see. None of them are big Yogis, some of them are mere beginners. It is certainly one of the signs that the higher Force (call it supramental or not) is beginning to influence Matter.
15 November 1933