Prayer: Does silent recitation in the heart count as "reading" in prayer?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: Does silent recitation in the heart count as "reading" in prayer?

English:

Question #466:

Does the word ‘reading’ also apply to the recitation of words in one’s heart without uttering them?

Answer #466:

‘Reading’ does not apply to this and expressing the words in a way that can be called ‘reading’ is obligatory in prayers.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer