Self - discipline was studied in the 1940 ’ s, but recent studies have shown that people have become much worse at exercising self - discipline.
فَكَلِمَةُ ٱللهِ أَنْبَأَتْ أَنَّ ٱلنَّاسَ فِي « ٱلْأَيَّامِ ٱلْأَخِيرَةِ » يَكُونُونَ « بِلَا ضَبْطِ نَفْسٍ » .‏ —‏ ٢ تي ٣ :‏ ١ -‏ ٣‏ .‏