Surah 52. At-Tur, Ayah 11

That Day will be a Day of Woe to the wrong doers described in two aspects, the rebels against Allah and Allah's Truth, just as it will be a Day of Joy and Thanksgiving to the Righteous, who are described in three aspects in verses 17 to 28. The rebels are here described as being those who openly defied Truth and plunged into wrong-doing, or who trifled with truth, who jested with serious matters, who had not the courage to plunge openly into wrong-doing but who secretly took profit out of it, who wasted their life in doubts and petty quibbles. It is difficult to say which attitude did more harm to themselves and to others. Both are aspects of deep-seated rebellion. But the mercy of Allah was open to all if they had repented and amended their lives.