Truth is to living what physics is to life.
We can't "see, smell or hear" the laws of physics, but without them, nothing works; that which we do see, smell and hear is the result of these laws being applied with purpose or spontaneously.
In the same way truth is the rail living rides on. Ethics, the rule of law, cultural norms, relationships, parenting, good government, freedom--to name but a few aspects of living--all work based on a set of core values, derived from the common grace of God, who wired humankind with an intrinsic sense of what truth is and an understanding of what's "right."
Truth, like physics, does not function in a deterministic way. I can ignore Newton's Law of Gravity and embrace a belief that I can float, then step of top of a tall building. Newton's Law does not override my choice. But my choice to embrace and believe I can float will not prevent a very bad outcome.
One can choose to believe that truth is relative, subject to change, given to multiple definitions or simply an outdated cultural moray. People, and cultures, can choose to ignore the truth, or worse, be deceived and believe a lie--at great peril. The result/reality of these choices is sobering. Living spirals out of control. Chaos trumps the rule of law, justice becomes a myth, bondage becomes the norm and brokeness the face of a nation.
Life does not work without physics. Living does not work without truth.
"...And you will know the truth, and the truth will set you free.” John 8.32
Liveitwell!