He seeks their willing desire, as Christians, to walk and please God as he had already taught them, and in fact to do so more and more. After the catechism, the Ten Commandments, the Creed, the Lord’s Prayer, there is really not more concepts to learn, but we come into the deeper knowledge of these things and of our own weaknesses. When Paul tells them “you know the commandments we gave you through the Lord Jesus” he means the basic teaching that he and Silas taught the Thessalonian church while he was with them. They have been instructed how to live, how to believe, and how to pray, as have we.