I have been a veil worker, temple sealer, officiator, and leader of prayer circles. I was also on a committee to revise the Endowment for LGBT people in the RCJC. At first, I thought all the ordinances and rituals were a bunch of empty mumbo jumbo, until I really immersed myself in the work. I had to memorize the lecture given in connection with the prayer circle, and how to conduct the prayer circle. I was determined to learn it by heart, so I walked around and around this big city block in LA until I memorized it. After the 10th time around the block, I realized that there was something very important and powerful to this.
I am going to toss out a few seemingly unconnected statements of Joseph Smith and others for you consideration, and for you to connect the dots:
Having therefore, brethren, boldness to enter into the holy place by the blood of Jesus, by the way which he dedicated for us, a new and living way, through the veil, that is to say, his flesh; and having a great priest over the house of God; let us draw near with a true heart in fulness of faith, having our hearts sprinkled from an evil conscience, and our body washed with pure water.—Hebrews 10:19-22.
“Let my servant William Law also receive the keys by which he may ask and receive blessings;” D&C 124:97
“You do not know how to pray and get your prayers answered.” Joseph Smith
“There are signs in heaven, earth, and hell. The Elders must know them all to be endowed with power,to finish their work and prevent imposition. The devil knows many signs but dos not know the sign of the Son of Man, or Jesus.No one can truly say he knows God until he has handled something, and this can only be in the Holiest of Holies.” —Joseph Smith, Diary, in “Book of the Law of the Lord.
“Thus we behold the keys of this Priesthood consisted in obtaining the voice of Jehovah that He talked with him [Noah] in a familiar and friendly manner, that He continued to him the keys, the covenants, the power and the glory, with which He blessed Adam at the beginning; and the offering of sacrifice, which also shall be continued at the last time; for all the ordinances and duties that ever have been required by the Priesthood, under the directions and commandments of the Almighty in any of the dispensations, shall all be had in the last dispensation, therefore all things had under the authority of the Priesthood at any former period, shall be had again, bringing to pass the restoration spoken of by the mouth of all the Holy Prophets; then shall the sons of Levi offer an acceptable offering to the Lord. “And he shall sit as a refiner and purifier of silver; and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the Lord.” (See Malachi 3:3.)
I am not convinced that if you are just doing vain repetition, an ordinance is a waste of time, but with understanding and the Spirit, these can literally open the heavens to you, and educate you about the Gospel and the Plan of Salvation in a way that nothing else can.