Paul didn't just tell people what to do; he showed them. His authority wasn't just given, it was earned through his actions.
In this verse, Paul reminds the Thessalonians that they know how they ought to live because they saw him and his companions in action. Their teaching carried weight because it was backed by their personal example.
Living Proof
Paul's ministry was marked by hard work and self-sacrifice. He didn't expect to be supported by the Thessalonians when he was with them, but chose to work, often with his own hands, to provide for himself and his companions. This demonstrated a commitment to the Gospel that went beyond mere words. It showed that their message was true and their commitment was genuine.