Attacks from adverse forces are inevitable: you have to take them as tests on your way and go courageously through the ordeal. The struggle may be hard, but when you come out of it, you have gained something, you have advanced a step. There is even a necessity for the existence of the hostile forces. They make your determination stronger, your aspiration clearer.
It is true, however, that they exist because you gave them reason to exist. So long as there is something in you which answers to them, their intervention is perfectly legitimate. If nothing in you responded, if they had no hold upon any part of your nature, they would retire and leave you. In any case, they need not stop or hamper your spiritual progress.
The only way to fail in your battle with the hostile forces is not to have a true confidence in the divine help. Sincerity in the aspiration always brings down the required succour. A quiet call, a conviction that in this ascension towards the realisation you are never walking all alone and a faith that whenever help is needed it is there, will lead you through, easily and securely.
Ref: Questions and Answers 1929–1931