Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) said:“Whoever is called to account on the Day of Resurrection will be ruined.”(The rest of the hadith has already been mentioned in the Book of Knowledge, under the chapter: Whoever heard something and did not understand it, then asked again so that he might understand...)

`Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that "by 'step by step' is meant the changing of conditions one after another," and this was stated by the Prophet Muhammad (peace be upon him) himself.