Halliday & Matthiessen (1999: 3):
This suggests that it should be possible to build outwards from the grammar, making the explicit assumption that the (abstract structure of) categories and relations needed for modelling and interpreting any domain of experience will be derivable from those of language. Our contention is that there is no ordering of experience other than the ordering given to it by language. We could in fact define experience in Linguistic terms: experience is the reality that we construe for ourselves by means of language.