In other words, relative truth exists because of undetermined truth. For instance, your belief of a heaven or hell under the prospect that neither have come to fruition yet. If this is true, then speculation may occur and thus, truth is absolute. However, if you submit to me that free will doesn't exist, then I will allot you the point that all truth is absolute. So, there are two options. A deity exists -- no free will/absolute truth. A deity doesn't exist -- free will/relative truth, i.e., I can cross the street tomorrow or I may not. Undetermined truth=speculative=relative.