The spiritual life in Islam begins with riyadat al-nafs , the inner warfare against the ego. Distracted and polluted by worldliness, the lower self has a tendency to drag the human creature down into arrogance and vice. Only by a powerful effort of will can the sincere worshipper achieve the purity of soul which enables him to attain God's proximity. The Revival of the Religious Sciences details the sophisticated spiritual techniques adopted by classical Islam. In the first step, On Disciplining the Soul, which cites copious anecdotes from the Islamic scriptures and biographies of the saints, Ghazali explains how to acquire good character traits, and goes on to describe how the sickness of the heart may be cured. Breaking the Two Desires , he focusses on the question of gluttony and sexual desire, concluding, in the words of the Prophet, that 'the best of all matters is the middle way'.