I have just added quotations and several wonderful sermons to the Christ Our Advocate section of discipleheart. A link to the page comes at the end of this update. The page is based on the following text:
1 John 2:1-2 (NKJV) 1 My little children, these things I write to you, so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous. 2 And He Himself is the propitiation for our sins, and not for ours only but also for the whole world.
I have always believed that Christ's advocacy on our behalf has been important, but while preparing for my teaching on the sanctuary in Bolivia, I came across statements that stated that Christ's intercession is just as essential as our redemption by His blood.
On the page and associated linked pages, you will find some of these statements. Some of them follow:
"And every one who will break from the slavery and service of Satan, and will stand under the blood-stained banner of Prince Immanuel, will be kept by Christ’s intercessions. Christ, as our Mediator, at the right hand of the Father, ever keeps us in view, for it is as necessary that He should keep us by His intercessions as that He should redeem us with His blood. If He lets go His hold of us for one moment, Satan stands ready to destroy. Those purchased by His blood He now keeps by His intercession. He ever liveth to make intercession for us “Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.” [Hebrews 7:25 Manuscript 73, 1893, par. 17.
"The intercession of Christ in man's behalf in the Sanctuary above is as essential to the plan of salvation as was His death upon the cross. By His death He began the work which after His resurrection He ascended to complete in heaven. Great Controversy, 489.
The subject of the Sanctuary and the investigative judgment should be clearly understood by the people of God. All need a knowledge for themselves of the position and work of their great High Priest. Otherwise, it will be impossible for them to exercise the faith which is essential at this time, or to occupy the position which God designs them to fill.—Great Controversy, 488.
“The Lord Jehovah did not deem the principle of salvation complete while only invested with His own love. By His own appointment He has placed at His altar an Advocate clothed in our nature. As our Intercessor, His office work is to introduce us to God as His sons and daughters. Christ intercedes in behalf of those who have received Him. To them He gives power by virtue of His own merits, to become members of the royal family, children of the heavenly King. And the Father demonstrates His infinite love for Christ, who paid our ransom by His blood, by receiving and welcoming Christ’s friends as His friends. He is satisfied with the atonement made. He is glorified by the incarnation, the life, death, and mediation of His Son. Letter 22, 1898, par. 3
“In Christ’s name our petitions ascend to the Father. He intercedes in our behalf, and the Father lays open all the treasures of His grace for our appropriation, to enjoy and communicate to others. “Ask in My name,” Christ says. “I do not say I will pray the Father for you; for the Father Himself loveth you, because you have loved me. Make use of My name. This will give your prayers efficiency, and the Father will give you the riches of His grace. Wherefore ask and ye shall receive, that your joy may be full.” [See John 16:26, 27, 24.] Letter 22, 1898, par. 4
“What condescension! What a privilege is granted us. Christ is the connecting link between God and man. He has promised His personal intercession by employing His name. He places the whole virtue of His righteousness on the side of the suppliant. Christ pleads for man, and man, in need of divine help, pleads for himself in the presence of God, using the power of the influence of the One who give His life for the world. As we acknowledge before God our appreciation of Christ’s merits, fragrance is given to our intercessions. Oh, who can value this great mercy and love! As we approach God through the virtue of Christ’s merits, we are clothed with His priestly vestments. He places us close by His side, encircling us with His human arm, while with His divine arm He grasps the throne of the infinite. He puts His merits, as sweet incense, in a censer in their hands, in order to encourage their petitions. He promises to hear and answer their supplications. Letter 22, 1898, par. 5
“Yes; Christ has become the medium of prayer between man and God. He also has become the medium of blessing between God and man. He has combined divinity and humanity. Men are to be co-laborers with God in the salvation of their own souls, and then make earnest, persevering, untiring efforts to save those who are ready to perish. Letter 22, 1898, par. 6”
As stated, you will find wonderful things about Christ's necessary intercessory work as our advocate at the following discipleheart section, where there are quotations, verses of the Bible and several new sermons. You will especially enjoy a "must read" sermon on effectual prayer:
https://www.discipleheart.com/prevailing-intercessory-prayer/your-prayer-questions-answered/christ-our-advocate-intercedes-for-us#heading-70143