But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.- Matthew 6:7

If prayer be a coming before the throne of God, it ought always to be conducted with the deepest sincerity, and in the spirit which makes everything real. If you are disloyal enough to despise the King, at least, for your own sake, do not mock Him to His face, and when He is upon His throne. If anywhere you dare repeat holy words without heart, let it not be in Jehovah’s palace. If a person should ask for audience with royalty, and then should say, “I scarce know why I have come, I do not know that I have anything very particular to ask; I have no very urgent suit to press;” would He not be guilty both of folly and baseness? As for our great King, when we venture into His presence, let us have an errand there…  let us beware of playing at praying. It is insolence toward God. If I am called upon to pray in public, I must not dare to use words that are intended to please the ears of my fellow-worshippers, but I must realize that I am speaking to God Himself, and that I have business to transact with the great Lord. And, in my private prayer, if, when I rise from my bed in the morning, I bow my knee and repeat certain words, or when I retire to rest at night go through the same regular form, I rather sin than do anything that is good, unless my very soul doth speak unto the Most High. Dost thou think that the King of heaven is delighted to hear thee pronounce words with a frivolous tongue, and a thoughtless mind? Thou knowest Him not. He is a Spirit, and they that worship Him must worship Him in spirit and in truth. If thou hast any empty forms to prate, go and pour them out into the ears of fools like thyself, but not before the Lord of Hosts. If thou hast certain words to utter, to which thou dost attach a superstitious reverence, go and say them in the bedizened courts of the harlot Rome, but not before the glorious Lord of Zion. The spiritual God seeks spiritual worshipers, and such He will accept, and only such; but the sacrifice of the wicked is an abomination unto the Lord, and only a sincere prayer is His delight.~ C.H. Spurgeon

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