John Gill expounds on 1 Peter 2:8, illustrating how Christ serves as a stone of stumbling and a rock of offense to those who disbelieve, particularly the Jews who could not accept His humble origins and the nature of His ministry. He discusses their misconceptions about the Messiah's glory and power, which led them to reject Jesus due to their expectations of a worldly king. Gill emphasizes that their disobedience to the Gospel and refusal to accept divine revelation are the root causes of their stumbling. He also notes that while some are appointed to believe, others are left in their disobedience, leading to their spiritual downfall. Ultimately, the sermon highlights the contrast between those who embrace Christ and those who reject Him due to their own understanding and expectations.