'Say, the evil and the good are not equal,' meaning: the lawful and the unlawful. 'Even if the abundance of the evil pleases you,' meaning: the abundance of the unlawful.
﴿قُلْ لَا يَسْتَوِي الْخَبِيثُ وَالطَّيِّبُ﴾ يَعْنِي: الْحَلَالَ وَالْحَرَامَ ﴿وَلَوْ أَعْجَبَكَ كَثْرَة الْخَبيث﴾ كَثْرَة الْحَرَام.