G. Campbell Morgan emphasizes the teachings of 2 Thessalonians, focusing on the distinction between 'our gathering together unto Him' and 'the Day of the Lord.' He addresses the confusion among the Thessalonian Christians regarding the timing of Christ's return and the manifestation of lawlessness, urging them to remain steadfast in their faith and conduct. Morgan highlights the importance of the Church as a restraining force against lawlessness and calls for courage and diligence in daily work while awaiting the Lord's return. He reassures believers that the ultimate victory belongs to Christ, who will destroy the lawless one and establish His Kingdom.