Accordingly, the most noble knowledge a man can learn and teach to others is the basis of belief (emaan) and its requirements. The best precautionary measures he can protect himself with is the knowledge of the characteristics of disbelief (Kufr), its causes and exigencies. If man has insight into these two important things, he will know the way of his happiness and follow it, and avoid the way of his misery.

In this book, we hope to elucidate the pillars of emaan and the characteristics of Kufr and its causes. To obtain utmost benefit from this book, we have divided it into three parts:
Part One: The Basis of emaan.
Part Two: The Reality of emaan.
Part Three: The Invalidation of emaan.