Tazkiyah literally means purification. In the extended sense it means growth. In this respect, Tazkiyah means intellectual development. The mind is not something stagnant, it is ever-growing, like a tree. It is this process which is called “adding faith to their faith” (48:4) in the Quran. Adding faith to faith means development in consciousness, which is another name for intellectual development. The real faith is one which does not stagnate, but grows continuously in its conviction about God.
How does Tazkiyah or intellectual development take place? The path to this is contemplation. "Contemplation" is in itself a continuous process – contemplating the Quran and Hadith, the life of the Prophet, the lives of the Companions, the various human disciplines, the universe, the earth and the heavens. There is also the kind of contemplation which takes place during serious discussions. In this process of contemplation, new ideas emerge, deeper meanings come to light, new aspects hitherto unexplored of different events and realities are discovered, and every experience will bring him closer to God.
Maulana Wahiduddin Khan is an Islamic spiritual scholar, who has adopted peace as the mission of his life. He was born in a family of landlords in 1925 at Badharia, a village near the town of Azamgarh, in the Indian state of Uttar Pradesh (formerly known as the Eastern United Provinces).
After his father’s death in December 1929 he was brought up by his mother, and his uncle, Sufi Abdul Hamid Khan, arranged for his education. He comments that becoming an orphan very early in life taught him that, to succeed in life, you have to take such situations as challenges and not as problems. Being an advocate of result-oriented and positive action, he explains that treating such situations as problems can only be negative in result. All you can do in this state is either try to fight to remove them or lodge complaints or protests against them. On the other hand, if you take such situations as challenges, you can positively and constructively work to overcome them yourself, as and when suitable opportunities present themselves. His success in life is largely due to the implementation of this and other such principles, which he has derived from Islamic scriptures.