Raising the voice to ward off whispers in the secret prayer

Q: Often, Iblis comes during the prayer to cause distraction, which leads to a state of forgetfulness, and perhaps I do not realize what verses I am reciting or how many rak'ahs I have prayed. I have heard that a person has no share of his prayer except what his heart is present for in it, so I began to raise my voice slightly in the prayer to keep Iblis away from me, and indeed I now realize what I am reciting. Is this permissible? Knowing that the voice is raised in a way that no one other than me can hear it, almost.

A: It is prescribed for the believing man and woman to turn their attention to the prayer, to be present in heart with it, and to strive for humility in it, as Allah the Exalted said: [Al-Mu'minun: 1-2]. When whispers are frequent, it is prescribed for the one praying, whether male or female, to spit to his left while in prayer and to seek refuge in Allah from Satan three times; because the Prophet (peace and blessings be upon him) directed 'Uthman ibn Abi al-'As al-Thaqafi (may Allah be pleased with him) to do so when he complained to him of the frequency of whispers in prayer.
There is no blame on you in raising your voice in recitation until you can hear yourself and combat the whispers thereby in the secret prayer. As for the loud prayers, such as Fajr and the first and second rak'ahs of Maghrib and 'Isha', it is recommended for men and women to recite loudly in them, because the Prophet (peace and blessings be upon him) used to do so, and likewise in the night prayer.