Inner speech (kalām nafsī) denotes the real, meaningful divine speech subsisting in God and not belonging to the class of letters and sounds. Articulated speech (kalām lafẓī) refers to the words, vocal performances, and written signs through which that meaning is expressed.
عَبَّرَ عَنْهَا بِالنَّظْمِ الْمُسَمَّى بِالْقُرْآنِ الْمُرَكَّبِ مِنَ الْحُرُوفِ
It is expressed by the ordered composition called the Qur'an, composed of letters.
An expression and what it expresses must not automatically receive the same temporal description. Humanly uttered sounds begin in time; the eternal attribute is not confined to these produced sounds.