How is the prostration of the heart sensed in detail, and what does "سبحان ربي الأعلى" (Glorified be my Lord, the Most High) mean, and is it necessary to sense its meaning during prostration, and how does a Muslim supplicate during prostration with a present heart and certainty of a response?

The prostration of the heart is its humility and submission to Allah Almighty, and this occurs both inside and outside of prayer. The prostration of the heart in prayer is achieved through the heart's reverence and contemplation of the remembrance recited by the worshipper. The meaning of "Subhana Rabbi al-A'la" (Glory be to my Lord, the Most High) is the glorification of Allah, the Most High, from every imperfection and flaw. As for supplication (du'a), one must adhere to the invocations mentioned in the Quran and Sunnah (definition), and feel that you are supplicating to the King of all dominion, the Rich, whose treasures never diminish, while being certain of a response.