movements or phenomena in the sadhana. The motion of her head is not a result of the descent of Force, or a sign that it is too much for her, but a wrong movement of the body which she must check and get rid of altogether.Sri Aurobindo
Letters of Sri Aurobindo
Volume IV - Part 2
Fragment ID: 14198
You can write to her that to get rid of fear is the first necessity. Yoga can only be done on a basis of faith and confidence in the Divine.
At the same time one must be on guard against undesirable movements or phenomena in the sadhana. The motion of her head is not a result of the descent of Force, or a sign that it is too much for her, but a wrong movement of the body which she must check and get rid of altogether.
The colours are only a sign that the inner vision is open; if it develops things of a more definite kind will appear.