Blindness in part is happened to Israel Romans 11:25
If ye have heard of the dispensation of the grace of God Ephesians 3:1-9
That if thou shalt confesswith thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.Romans 10:9 For I delivered unto youfirst of all that which I also received, how that Christ died for our sins according to the scriptures; 4 And that he was buried, and that he rose again the third day according to the scriptures:1 Corinthians 15:1-4 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: 9 Not of works, lest any man should boast. Ephisians 2:8-9
11 But I certify you, brethren, that the gospel which was preached of me is not after man.
12 For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
Christ gave Paul the dispensation of Grace. Only in Paul letters Romans till Philemon’s we find the doctrines that Christ gave to members of the body of Christ Jews and Gentiles in one body. If we talk about how to read the Bible, I will suggest any one to start reading and studying Paul letter to the Romans but before you study Romans go first and study Paul letters to the Galatians. Why ? this is the first letter that Paul wrote. In this letter you will understand what happen in acts 9 when Christ saved Paul and told him:
15 But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, and kings, and the children of Israel: 16 For I will shew him how great things he must suffer for my name's sake. Acts 9