Before (Satan) was sentenced to banishment from Heaven, his course was with convincing clearness shown to be wrong, and he was granted an opportunity to confess his sin, and submit to God's authority as just and righteous.(4SP 319)

All that man needs to know or can know of God has been revealed in the life and character of His Son. (8T 286)

Whereas certain false teachers of his day were depicting Christ as one aspect of the display of God's fullness, Paul insists, as we have already seen, that "the whole fullness of deity" dwells in Christ (Col 2:9). No aspect of God's fullness was withheld from the incarnation. All we can and need to know about God is found in Christ, for God fully dwells in and is revealed in Christ.(Is God to Blame? by Greg Boyd, emphasis mine)

No truth is more clearly taught in the Bible than that God by His Holy Spirit especially directs His servants on earth in the great movements for the carrying forward of the work of salvation. Men are instruments in the hand of God, employed by Him to accomplish His purposes of grace and mercy. Each has his part to act; to each is granted a measure of light, adapted to the necessities of his time, and sufficient to enable him to perform the work which God has given him to do.

But no man, however honored of Heaven, has ever attained to a full understanding of the great plan of redemption, or even to a perfect appreciation of the divine purpose in the work for his own time. Men do not fully understand what God would accomplish by the work which He gives them to do; they do not comprehend, in all its bearings, the message which they utter in His name. {GC 343.2}

"Canst thou by searching find out God? canst thou find out the Almighty unto perfection?" "My thoughts are not your thoughts, neither are your ways My ways, saith the Lord. For as the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than your thoughts." "I am God, and there is none like Me, declaring the end from the beginning, and from ancient times the things that are not yet done." Job 11:7; Isaiah 55:8, 9; 46:9, 10. {GC 343.3}

Even the prophets who were favored with the special illumination of the Spirit did not fully comprehend the import of the revelations committed to them. The meaning was to be unfolded from age to age, as the people of God should need the instruction therein contained. {GC 344.1}

I believe the statement. But, what does mankind "need to know"? And, what "can" we know about God? We are obviously capable of knowing everything we need to know about God. However, you seem convinced that this statement encompasses everything there is to know about God, rather than what we "can" and "need" to know about Him. On this we disagree.

By the way, I changed my observations regarding 4SP 319. Apparently, you don't remember.

It is impossible for finite minds fully to comprehend the character or the works of the Infinite One. To the keenest intellect, the most highly educated mind, that holy Being must ever remain clothed in mystery. "Canst thou by searching find out God? canst thou find out the Almighty unto perfection? It is as high as heaven; what canst thou do? deeper than hell; what canst thou know?" Job 11:7, 8. {SC 105.3}

The apostle Paul exclaims, "O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are His judgments, and His ways past finding out!" Romans 11:33. But though "clouds and darkness are round about Him," "righteousness and judgment are the foundation of His throne." Psalm 97:2, R.V. We can so far comprehend His dealings with us, and the motives by which He is actuated, that we may discern boundless love and mercy united to infinite power. We can understand as much of His purposes as it is for our good to know; and beyond this we must still trust the hand that is omnipotent, the heart that is full of love. {SC 106.1}

The word of God, like the character of its divine Author, presents mysteries that can never be fully comprehended by finite beings. The entrance of sin into the world, the incarnation of Christ, regeneration, the resurrection, and many other subjects presented in the Bible, are mysteries too deep for the human mind to explain, or even fully to comprehend. But we have no reason to doubt God's word because we cannot understand the mysteries of His providence. In the natural world we are constantly surrounded with mysteries that we cannot fathom. The very humblest forms of life present a problem that the wisest of philosophers is powerless to explain. Everywhere are wonders beyond our ken. Should we then be surprised to find that in the spiritual world also there are mysteries that we cannot fathom? The difficulty lies solely in the weakness and narrowness of the human mind. God has given us in the Scriptures sufficient evidence of their divine character, and we are not to doubt His word because we cannot understand all the mysteries of His providence. {SC 106.2}

TE: The statement says that all that *man* can know about God was revealed in Christ, not all that can be known about God.

MM: I agree. Jesus did not reveal "all that can be known about God." He only revealed what we are capable of understanding, which is what we need to know to get save and to stay saved.

TE: We will be learning about God for all eternity. But everything we learn was revealed in Christ.

MM: Again, we disagree. Because of our dullness, Jesus was unable to reveal "everything" we will ever learn about God throughout eternity. He said, "I have yet many things to say unto you, but ye cannot bear them now."