Tazkiya means preparing oneself with regard to the Hereafter, that is, developing in oneself those qualities which will benefit one in the Hereafter. The way of Tazkiya is to activate one’s thinking. One way to do this is to identify such incidents in one's life when one was going to be plunged into some great trouble but was saved by the special succour of God. It is a must for the seeker of Tazkiya to recall such incidents repeatedly in order to refresh the mind of how, when he had reached the very brink of destruction, was saved by the special intervention of God. He should keep remembering every graphic detail of these incidents and beseech God thus: “O God, you have repeatedly saved me from the horrible consequences of my actions in the life of this world. In the same way, save me from the horrible punishment of hell in the Hereafter.”
Importance of Tazkiyah in Islam