Will give many of the answers, and those Chapters must be understood in the spirit, not the flesh, for the age of flesh will be past history at that time during God's Millennium reign on earth.

 

Gal 3:22   But the Scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe,

     As 1 John 3:4 said, "...for sin is the transgression of the law."  If anyone could be perfect in following The Law, Christ would not be needed. 

 God made sure that we all fall short for a reason. To show us that without Him through His Son, we are vanity. Call it a humbling, or whatever one wishes to name it. It still shows that Yehovah is The Only GOD; there is none else.
     Notice Paul is pointing out a condition with this verse. That is the 'promise by faith of Jesus Christ' might be given to believers, and not to those who refuse Christ. Those who refuse, well, they've got a bit more humbling coming. That's why God gave us His Law, to show us that we cannot do our own Salvation.
     (Those who rebel, having no interest in GOD's Promise, attempting to do their own salvation, will not admit it, but they lead miserable lives. The reason why their pride keeps pushing them into walls is because their senses have become 'numb' to suffering. They've gotten somewhat used to it, as an addiction. That's a terrible price to pay for self-pride, and determination to prove GOD wrong. The wicked one loves them for it, and is laughing at every wrong step they make, as they grope in darkness. They may show their ill-gotten gains and riches, but they won't tell you how miserable hanging on to it makes them. When through all their meticulous craft and great planning of precision, after beating down God's children, and God raises up His, miraculously, with no apparent planning, it really stumps their understanding and riles their anger at God even the more. Again, Satan loves them for their ignorance, and even he gets angry when they fail. The ensuing battle of Armageddon, which GOD fights, not us, will be their biggest coming 'wall' against all their apparently well thought out plans for world government. They think they are setting the 'trap'. In reality, God is setting the 'trap' for them.)

 

Gal 3:23   But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed.
24    Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.

     Paul finally hits it on the nail. The Law was given so that we would know of GOD's Promise that His Son would come offering Salvation to all who would believe on Christ. The Law was our constant pointer and reminder of that Promise and how we were to prepare for Him and serve Him.

 

Gal 3:25    But after that faith is come, we are no longer under a schoolmaster.
26    For ye are all the children of God by faith in Christ Jesus.

     Here comes a verse that stirs many. Since Christ came, The Holy Spirit is now our 'schoolmaster'. The Spirit is our 'Guide' in understanding God's Word, and our Mission for today as Christ's servants.

 

 John 14:26; But the Comforter, Which is the Holy Ghost, Whom the Father will send in My name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.