This is a scholarly excerpt on the development of early Sufism, situating it within the broader tradition of Islamic religious history and comparative mysticism. It traces how Sufism evolved from pietist asceticism into a mystical tradition centered on ecstatic union with God — a "unitive state" the author explicitly compares to the atman-brahman merger in Hindu thought — and how this brought Sufis into growing conflict with orthodox Islamic legalists. The text profiles two contrasting figures: Junayd of Baghdad, a "sober" mystic who sought genuine union with God while resisting self-indulgent ecstasy, and the more radical al-Hallāj, who was publicly crucified in 922 CE for claiming "I am the Truth" — a statement his defenders read as the mystic's self-dissolution into God rather than a claim to personal divinity. A distinctive thread throughout is the tension between private mystical experience and public religious law, dramatized in al-Hallāj's execution prayer forgiving his killers on the grounds that God revealed to him what was hidden from them. The author leans toward rehabilitating al-Hallāj, arguing his poetry and final words suggest misunderstood spiritual union rather than heretical self-divinization or pantheism.