The quote seems perfectly fine in illustrating the idea that reality will always transcend our language or thought (to the extent that can be expressed in any language).

And if you appreciate Hindu scripture, that particular quote could have been lifted almost verbatim from the Upanishads.

I don't appreciate the dogmatism that is associated with a lot of orthodox Islam either, but this is something similar to a lot of conservative religious outlooks, as you can find among people identifying as Hindu, Buddhist, Christian, etc. But in fact this particular quote can be seen as antithetical to any such dogmatic position, and it's worthwhile to recognize points of agreement even though you might disagree in other areas.