3 how that by revelation He made known to me the mystery (as I have briefly written already, 4 by which, when you read, you may understand my knowledge in the mystery of Christ), 5 which in other ages was not made known to the sons of men, as it has now been revealed by the Spirit to His holy apostles and prophets… (Ephesians 3:3–5, NKJV)
God miraculously revealed His gospel plan to Paul and the other apostles of Christ. You can understand what Paul knew about God’s great redemptive plan “when you read” what he wrote. To paraphrase Paul, “You can know what I know when you read what I wrote.” The Bible is not impossible to understand. Truly, it is a revelation, not a concealment. You are responsible for reading and learning it for yourself so that your faith will be in the powerful word of God and not in the will and wisdom of men (1 Cor. 2:4-5). Spend time reading the Scriptures every day. By doing so you will come to know God’s will for your life and, by then doing His will, you will please God (2 Cor. 5:9).