Muhammad the Messenger, may Allah bestow grace and peace upon him, once transmitted these words directly from the Most High:
Among the most intimate to Me of My saints are the believers of humble means who find their pleasure in prayer, worshipping their Lord in the most beautiful way, and who obey Him both secretly and openly. These saints are hidden among the people. They are not always pointed out by Me. They are content with small sustenance. They receive and bear trials patiently.
The Messenger of Allah went on to comment about these secret lovers:
Their death comes swiftly, their mourners are few, their family inheritance is meager.
At that, he struck his thigh with great enthusiasm.
(Hadith Qudsi transmitted by Abu Umama)
'Spiritual Gems: The Mystical Qur'an Commentary Ascribed by the Sufis to Imam Ja'far al-Sadiq'
By Ja'far al-Sadiq (Author), Farhana Mayer (Translator)
This book contains some of the Quranic Commentary attributed to Iman Jafar Al Sadiq. He is described as one of the founders of Sufism and mystical practice in Islam. He was known to be one of the great teachers in Islamic understanding.
As such this commentary is incredibly valuable and insightful in early Islamic Quranic interpretation. The text is well translated and easy to follow. On a first read it is easy to see the value in his commentary but it takes some consideration and thought to gain any sense of how exceptional it is.
The introduction to the translation and the footnotes are very good. They really add value to the book and help the reader to appreciate the depth of the commentary. There is also the original Arabic in the back which is helpful when considering the translation.