In the high Renaissance, in fact, there was a hope that more direct knowledge of the wisdom of antiquity, including the writings of the Church fathers, the earliest known Greek texts of the Christian Gospels, and in some cases even the Jewish Kabbalah, would initiate a harmonious new era of universal agreement. With this end in view, Renaissance Church authorities afforded humanists what in retrospect appears a remarkable degree of freedom of thought. One humanist, the Greek Orthodox Platonist Gemistus Pletho (1355–1452), based in Mystras, Greece (but in contact with humanists in Florence, Venice, and Rome) taught a Christianised version of pagan polytheism.
Who gave followers of Humanism the ability to think inside the box?