Every True Christian believer who does not fully understand the Truth about his Authority according to the aforementioned Scripture would always struggle to reign on the Earth. If you can only diligently and carefully study the same Scripture, you would notice that the Lord Jesus used the phrase "All Authority." He also revealed in clear terms His Scope of Dominion being "Heaven" and "Earth," meaning His Authority extends throughout the Entire Universe. He Himself paid in Full the Price for sin simply because it was a sin that relegated the entire Universe into darkness as a result of the Fall of man. The implication is therefore this: If the whole Universe was redeemed by the Blood of Jesus, it therefore means that there's nothing irredeemable but rather it's only a question of the price tag. If you observe, anything your money can purchase is whatever you have Authority over. The Holy Bible declares that we were purchased with a Price i.e., the Precious Blood of Jesus (1 Cor. 6:20) hence the importance of us exercising the Authority He has given to us.
The Lord Jesus has obtained the Authority and we are the Expression thereof. In other words, He extended His Authority to the Church as His Bride in order that we might co-rule with Him the same way the Sun and the Moon have their own jurisdiction, sphere and time of Dominion: "Assuredly, I say to you, whatever you bind on Earth will be bound in Heaven, and whatever you loose on Earth will be loosed in Heaven" (Matt. 18:18 NKJV). What this Scripture is actually explaining is that Jesus committed unto us the Earth to rule on His Behalf (Ps. 115:16). He said that whatever we bind on Earth is what He binds in Heaven. Simply put, He is the One Who will surely complete our decrees as we continue Looking unto Jesus the Author and Finisher of our Faith; Who for the Joy that was set before him endured the Cross, despising the shame, and is set down at the Right Hand of the Throne of God" (Heb. 12:2). Through the Covenant we have cut with the Lord Jesus, we became partakers of His Inheritance hence we have His Full Authority and Divine Backing. Anytime we speak in the Name of Jesus, all of Creation must align with us. On the basis of this Truth, let us always maximise this Authority to bring Glory to the One Who gave it to us in the first place that He may receive a return on His Investments.