One of the fundamental principles of the Baháʼí Faith is that religious truth is not absolute but relative. The teachings of the different world religions are seen as 'facets of one truth'. Baháʼí texts include statements of a dualist nature (e.g. in the "Book of Certitude") and statements of a monist nature (e.g. in the "Seven Valleys" and the "Hidden Words"). Moojan Momen, in his translation of ʻAbdu'l-Bahá's commentary on the tradition ""I was a Hidden Treasure"", states that the differences between dualist and monist views are reconciled by the teaching that these opposing viewpoints are caused by differences in the observers themselves, not in that what is observed. This is not a 'higher truth/lower truth' position. God is unknowable. For man it is impossible to get any knowledge of God or the Absolute, because any knowledge that one has, is relative. Theological differences about God are caused by imagination, as God's essence can not be described. Less stress is given to metaphysical subjects, while ethics and social action are emphasized.