Luke 1:4

ESV that you may have certainty concerning the things you have been taught.
NIV so that you may know the certainty of the things you have been taught.
NASB so that you may know the exact truth about the things you have been taught.
CSB so that you may know the certainty of the things about which you have been instructed.
NLT so you can be certain of the truth of everything you were taught.
KJV That thou mightest know the certainty of those things, wherein thou hast been instructed.

What does Luke 1:4 mean?

The certainty which Luke wants to inspire is not a matter of wishful thinking, blind faith, or preference. His entire purpose for writing this gospel is to collect truth, in the form of eyewitness accounts, facts, and evidence (Luke 1:1–3). Luke was present for many crucial events in the early church, as a co-worker with the apostle Paul (Acts 1:1–3; 16:10). In his travels, he likely met many key figures in Jesus' earthly ministry. For this reason, Luke feels confident that his work can be of use.

Biblical faith has always placed great emphasis on truth and reason (Acts 17:11; 1 John 4:1; 2 Corinthians 13:5; Colossians 2:8). It is because of known events, and established truths, that Christians should be confident in God's promises (Hebrews 12:1; 2 Peter 1:16). We don't know who Theophilus is, exactly. What do know Luke seeks to strengthen his faith in the truths being taught about Jesus Christ. That greatly benefits modern readers, as well.
What is the Gospel?
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