Boundaries of Blessing

Joshua 1:7 says "Only be strong and very courageous, being careful to do according to all the law that Moses my servant commanded you. Do not turn from it to the right hand or to the left, that you may have good success wherever you go." There is one God and thus there is one truth. However we live in a culture that worships many ‘gods’ and believes truth is relative.  If absolute truth exists it means we can build solid foundations and that there are sure things that we have the ability to TRULY know.