Many people say:
‘I say my morning and evening supplications regularly and we seek refuge in Allaah yet we still experience afflictions.’
So we say if you recite the morning and evening supplications then it is necessary to move the tongue while reciting them, there is no benefit if you pass your eyes along the lines of the page and to say that this is a silent reading. This is not considered reading or speech in the Arabic tongue. Reading in the Arabic language necessitates movement of the tongue, as is known from the hadeeth which is narrated from the Companions -may Allaah be pleased with them- that they knew when the Messenger -sallAllaahu alayhi wa sallam- was reciting silently due to the movement of his beard. This illustrates that the Messenger -sallAllaahu alayhi wa sallam- whilst reciting silently would move his lips and tongue.
This moving of the tongue is if the person has the capability to move his tongue and that there is nothing to hinder the movement of the tongue.’
The correct way to recite in your prayers (Salah) and in morning and evening supplications – By Muhammad bin Umar Bazmool, Translated & Foreword by Umm Yahya
[Taken from: ‘Sharh Sifat Sallat an-Nabi –sallAllaahu alayhi wa sallam-‘ by Muhammad Bazmool, p.221]