What does 3 John 1:3 mean?

"Truth" is mentioned first in verse 1, then twice more here. First, John rejoices about truth: believers who had visited Gaius and his congregation spoke well of the situation in this church. Second, John states Gaius walked in truth. This is from the Greek word alētheia, meaning "actual, real, and objectively accurate." Gaius was an example to those he led. John observed that his church members followed the model set before them by Gaius. Truth is not something only to know, but something we "walk" or practice. The importance of a good example is a major theme of 3 John, and a common one for the apostle John's writings. He shares very similar words in 2 John 1:1–4 and mentions truth nine times in 1 John. The gospel of John mentions truth more than 20 times.