This article is from Purification of the Mind (Jila’ Al-Khatir)
When someone’s heart becomes pure, the Prophet (Allah’s prayer and peace be on him) becomes an ambassador between him and his Lord (mighty and glorified is He), as Gabriel did. The foundation of good is to follow the Prophet (Allah’s prayer and peace be on him) in both his words and works. When the heart of the servant becomes pure, he will see the Prophet (Allah’s prayer and peace be on him), commanding him to do this and prohibiting him from doing that. He will become totally a heart. He will retire with full knowledge. He will become an innermost being with no publicity, purity with no impurity. Clear up everything from the heart. Pulling out the firm mountains requires mattocks of strife and enduring with patience the sufferings and the arrival of tribulations.