Some Jewish, Christian and Muslim Medieval philosophers, including Moses Maimonides and Pseudo-Dionysius, as well as many sages of other religions, developed what is termed as apophatic theology or the Via Negativa, the idea that one cannot posit attributes to God and can only discuss what God is not. For example, we cannot say that God "exists" in the usual sense of the term, because that term is human defined and God's qualities such as existence may not be accurately characterized by it. What we can safely say is that it cannot be proven empirically or otherwise that God is existent, therefore God is not non-existent.