In Hebrews 8:10-11a, God instructs us:

For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people: And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.

These verses are especially focusing on God’s salvation plan. Throughout the church age, the dominant teaching of most Biblical churches was to tell the brothers and sisters of the congregations how they might be sure they are saved or how they might become saved. A careful analysis of the teachings of these denominations invariably shows that they include the requirement that some contribution be made by the individual seeking salvation. These contributions could include actions such as water baptism, public profession of faith, the act of accepting Christ, the partaking of the Eucharist or communion table, or praying a certain kind of prayer. In virtually every case, there was a definite violation of the law of God, which clearly stipulates that all the work of saving a person was done by Christ, long before that person was born.
In Hebrews 8:10-11, quoted above, God emphasizes that once the full revelation of the Bible occurs, the teaching on salvation in the world will be altogether Biblical. Mankind will not be taught how they might become saved, but rather that salvation is entirely the work of God (Ephesians 2:8-9). God will saving a great multitude who actually may understand very little of the Bible.