Imam has undertaken precious discussions in this regard in his famous book titiled "The discipline of prayers" as following:
A cordial discipline of worship, especially the invoking worship, is “informing” [tafhīm].
It is to take the heart, at the beginning, as a child not yet able to speak, and is wanted to be taught.
So, each of the invocations, recitations, facts and secrets of worship is to be taught to the heart with strict accuracy and effort, and whatever the degree of perfection, one has to teach to the heart the facts which he has so far recognized.
Even if one was unable to understand the meanings of the Qur'an and the invocations, and had no share of the secrets of worship, he, nevertheless, would have to teach his heart the very general meanings, such as telling it that the Qur'an is the words of Allah, that the invocations are remembrance of Allah, and that worship is obeying the Creator.
He has to teach his heart such general information.
Should he be of those who understand the apparent meanings of the Qur'an and the invocations, such as the promises, warnings, biddings and forbiddings, as well as the information about the Source [mabda'] and Resurrection [ma'ād], he must inform his heart of whatever has been understood from them by him. Should a fact of knowledge or a secret of worship be exposed to him, he is to inform it to his heart carefully and strictly.
The result of such information is that after a period of perseverance the tongue of the heart will open to speaking and will become an invoker and a reminder.
Imam explains At the beginning the heart is a learner and the tongue a teacher. Whenever the tongue invokes, the heart also becomes an invoker, and so the heart is a follower of the tongue.
But after that the heart's tongue learns to speak, the contrary happens: the heart becomes invoker and the tongue follows it in invocation and in movement. Rather, sometimes it happens that even when man is sleeping, his tongue starts invocating in pursuit of his heart's invocation, as the heart's invocation is not confined to the state of wakefulness, and when the heart remembers, the tongue, having become its follower, starts invocating after it, and it leaks out from the dominion of the heart:
“Say: Every one acts according to his own manner…”