The Apostle Paul said, For no other foundation can anyone lay than that which is laid, which is Jesus Christ (1 Corinthians 3:11) So we begin by looking at the life and ministry of Jesus Christ as recorded in the Gospel of John...
Jesus said to him, (Thomas) "I am the way, the truth, and the life. No one comes to the Father except through Me. "If you had known Me, you would have known My Father also; and from now on you know Him and have seen Him. Philip said to Him, "Lord, show us the Father, and it is sufficient for us." Jesus said to him, "Have I been with you so long, and yet you have not known Me, Philip? He who has seen Me has seen the Father; so how can you say, 'Show us the Father'? Do you not believe that I am in the Father, and the Father in Me? The words that I speak to you I do not speak on My own authority; but the Father who dwells in Me does the works. Believe Me that I am in the Father and the Father in Me, or else believe Me for the sake of the works themselves. (John 14:6-11)
Christ is the way, the Truth (reality) and the life concerning all aspects of the Father. To know Christ is to know the Father. By studying the life and ministry of Jesus Christ, we will see clearly that He perfectly reveals the Father in all matters. If Christians fail to believe this truth concerning Christ as the one who perfectly expresses the Father's will in ALL matters they will continually be overshadowed with doubts which means that they will always struggle with issues that are clearly the Father's will such as healing, finances, etc. and especially as to whether the bad thing that they encounter in life come from God. Christ has already set them free through His death, burial, resurrection, ascension and glorification and yet beneath the, "I believe that" lies doubt that neutralizes what they say they believe.
While the entire Bible reveals the Father's will, much of His purpose remained hidden until they were fully revealed in Christ...
In Him (Christ) we have redemption through His blood, the forgiveness of sins, according to the riches of His grace which He made to abound toward us in all wisdom and prudence, having made known to us the mystery of His will, according to His good pleasure which He purposed in Himself (Ephesians 1:7-9)
The writer of Hebrews expresses Christ revealing the Father in all matters in this way...
God, who at various times and in various ways spoke in time past to the fathers by the prophets, has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds; who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high, having become so much better than the angels, as He has by inheritance obtained a more excellent name than they. (Hebrews 1:1-4)
Look closely at verse three...
"Who being the brightness of His glory and the express image of His person...
A more literal translation of this verse would read...
Jesus Christ is the radiance or exact reflection of the Father's glory as well as the exact representation and reproduction of the Father's nature and character.
So with this in mind, we must conclude that the Old Testament as well as the Epistles cannot be properly interpreted without a clear understanding of what Jesus both taught and demonstrated in His life and ministry. No one ever revealed the Father's will, nature, character and purpose perfectly in every way until Jesus Christ.
I pray that you take some quiet time to consider these truths concerning Christ's relationship with the Father and how it is in Him that the will of the Father is perfectly revealed. Although some of these truths may be somewhat difficult for some to comprehend, do not lose heart. Jesus said, However, when He, the Spirit of truth, has come, He will guide you into all truth..." (John 16:13) By leaning on the guidance of the Holy Spirit concerning these truths, the doubts that have kept you from living in a totally victorious life will begin to wane and faith with begin to rise.