The vibrations not only need to be in one, one needs to see colors, objects, maybe images that are harmonious with those intentional vibrations.
It helps mirror the intensity, both within and without, that the words are just a key to get you there.
Crowley was a great fan of what he called “barbarous languages”. Speaking them, with no real clear sense of what one is saying, forces one down into the one’s actual depths, so that from there, like a roar or a song it may go forth to take you there. Or at least further down the road.