Single solution for all types of correction, improvement and rectification

 *"There is no doubt that the single way of correction and rectification in every time and place is the way of calling to correct 'aqeedah and tawheed and that all worship should be made purely and sincerely for Allaah alone."*

-- Shaykh Rabee' Ibn Haadee al-Madkhalee

Source: "The Methodology of the Prophets in Calling to Allaah" (english translation), page - 75