The goat in vision is often symbolic of lust.
It can also represent agility.
Desire takes a long time to get rid of entirely. But, if you can once get it out of the nature and realise it as a force coming from outside and putting its claws into the vital and physical, it will be easier to get rid of the invader. You are too accustomed to feel it as part of yourself or planted in you — that makes it more difficult for you to deal with its movements and dismiss its ancient control over you.
You should not rely on anything else alone, however helpful it may seem, but chiefly, primarily, fundamentally on the Mother's Force. The Sun and the Light may be a help, and will be if it is the true Light and the true Sun, but cannot take the place of the Mother's Force.
The action of the animal sex-energy in Nature is a device for a particular purpose in the economy of the material creation in the Ignorance. But the vital excitement that accompanies it makes the most favourable opportunity and vibration in the atmosphere for the inrush of those very vital forces and beings whose whole business is to prevent the descent of the supramental Light.