..the spiritual peace is something other and infinitely more than the mental peace and its results are different, not merely clear thinking or some control or balance or a sattwic state. But its greater results can only be fully and permanently manifest when it lasts long enough in the system or when one feels spread out in it above the head and on every side stretching towards infinity as well as penetrated by it down to the very cells. Then it carries with it the deep and vast and solid tranquillity that nothing can shake – even if on the surface there is storm and battle. I was myself of the sattwic type you describe in my youth, but when the peace from above came down, that was quite different.
Ref: Letters on Himself and The Ashram