After Adam and Eve partook of the forbidden fruit and were driven out of the Garden of Eden, God taught them to offer sacrifices as a religious ritual. Determined to be obedient, Adam built an altar of stone and offered sacrificial animals upon it on a regular basis for "many days."
An angel eventually appeared to Adam and Eve and asked them if they understood the significance of this ritual. "Why dost thou offer sacrifices unto the Lord?" Surely, Adam and Eve must have asked themselves that same question many times. To the angel's question, Adam's answer is a perfect example of submissive obedience. "I know not, save the Lord commanded me" (see Moses 5:6).
Satisfied that Adam and Eve would be obedient no matter the logical reason, the angel explained the significance of the blood sacrifice. It represented the sacrifice that would be made by the Only Begotten Son of God to atone for the sins of the world.
Because of the Atonement of the Son of God, the conduit to the Father was opened, with Christ as the Advocate and Mediator. The angel then delivered this commandment to Adam and Eve:
Wherefore, thou shalt do all that thou doest in the name of the Son, and thou shalt repent and call upon God in the name of the Son forevermore.
--Moses 5:8
I rely on Jesus's atonement and grace when I approach the Father in Jesus's name. He washes me, clothes me in spotless apparel, and accompanies me to the Father's throne when I pray in His name. He advocates my cause, takes my imperfect prayer, polishes it, and represents it perfectly to the Father.
God hears every prayer, but when I include Christ as my Advocate, Counselor, Champion, and Tutor, my prayers can become powerful indeed.
Jesus testified during His earthly ministry that the Father heard Him (see John 12:41-42). When I pray in His name, I tap into His power and claim the same privilege to always be heard.
It is the height of arrogance to do good and to approach the Father in my own name, for I am never good enough or worthy enough on my own to fully satisfy Him. However, when I do my best and come to the Father totality dependent on Jesus in the depths of humility, Jesus satisfies the Father for me, and I please Him.
Jesus makes it possible for me to have a relationship with the Father. To cut Him out of the equation is to seriously diminish my opportunity for grace and divine approbation.