People with wisdom know that it is important to correct their own mistakes, while people without wisdom find it necessary to point out the mistakes of others. People with strong faith know that it is important to clear their own hearts, while those with unsteady faith seek to find fault in the hearts and prayers of others. This becomes a habit in their lives. But those who pray to Allah with faith, determination, and certitude know that the most important thing in life is to surrender their hearts to Allah.

Islam and World Peace: Explanations of a Sufi (2004)