The Power can do everything …

The Power can do everything, change everything and will do that but it can do it perfectly and easily and permanently only when your own will mental, vital and physical has been put on the side of the Truth. If you side with the vital ignorance and want to fight against your own spiritual change, it means a painful and difficult struggle before the work is done. That is why I insist on quietude at the very least and patient confidence with it, as far as you can—so that there may be a quiet and steady progress, not a painful and tormented movement full of relapse and struggle.

Ref : Letters on Yoga Vol. III