What to read after Rationalism in Zoroastrianism?

As a Strong believer in the moral value of all major religions and as an advocate of interfaith understanding and religious harmony, I congratulate Mr Kabraji on his effort. His Holiness Dalai Lama Zoroastrianism is the oldest of the revealed world-religions, and it has probably had more influence on mankind, directly and indirectly, than any other single faith. Mary Boyce, Zoroastrians: Their Religious Beliefs and Practices Zarathushtra was the greatest of all the pioneer prophets who showed the path of freedom to men, the freedom of moral choice, freedom from blind obedience to unmeaning injunctions freedom from multiplicity of shrines which draw our worship away from the single-minded chastity of devotion. Though surrounded by the believers in magical rites, he proclaimed in those dark days of unreason that Religion has its truth in its moral significance, not in external practices of imaginary value; that it is to upholdman in his life of good thoughts, good words and good deeds Rabindranath Tagore in the Religion of Man -Believe not what you hear; - believe not legends; - believe not gossip, - believe not what you are habituated to listening to since childhood; - believe not because it comes from the lips of the elders; - but apply it to your own study, examine it, ponder on it and believe only what your intelligence accepts. Gautama Buddha in Kalmo Satta (The same philosophy as Zarathushtra proclaimed nearly 600 to 800 years earlier?)