Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need. – Hebrews 4:16

True prayer is an approach of the soul by the Spirit of God to the throne of God. It is not the utterance of words, it is not alone the feeling of desires, but it is the advance of the desires to God, the spiritual approach of our nature towards the Lord our God. True prayer is not a mere mental exercise, nor a vocal performance, but it is deeper far than that-it is spiritual commerce with the Creator of heaven and earth. God is a Spirit unseen of mortal eye, and only to be perceived by the inner man; our spirit within us, begotten by the Holy Ghost at our regeneration, discerns the Great Spirit, communes with Him, prefers to Him its requests, and receives from Him answers of peace. It is a spiritual business from beginning to end; and its aim and object end not with man, but reach to God Himself.

In order to such prayer, the work of the Holy Ghost Himself is needed. If prayer were of the lips alone, we should only need breath in our nostrils to pray: if prayer were of the desires alone, many excellent desires are easily felt, even by natural men: but when it is the spiritual desire, and the spiritual fellowship of the human spirit with the Great Spirit, then the Holy Ghost Himself must be present all through it, to help infirmity, and give life and power, or else true prayer will never be presented, but the thing offered to God will wear the name and have the form, but the inner life of prayer will be far from it.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1024.cfm