Antisemitism, described as 'the ancient evil,' has a long and troubling history dating back to antiquity, with Jewish communities often persecuted for maintaining their distinct faith and traditions. The article traces the evolution of antisemitism through the ages, highlighting its institutionalization within the Roman Catholic Church and the significant reforms brought about by Vatican II, which condemned all forms of hatred against Jews. Recent popes, notably John Paul II and Benedict XVI, have worked to repair relations and emphasize the importance of remembrance and resistance to hatred. The piece warns of the resurgence of antisemitism in modern America, fueled in part by social media, and urges all people, especially Christians, to unequivocally condemn antisemitism while being cautious in making accusations. The author advocates for shunning those who openly embrace antisemitism, emphasizing that engagement only serves to reward and perpetuate this enduring hatred.