Does truth matter? Is it relative? Can persons genuinely have their own individual truths? These questions initially appear idiotic; however, truth has fallen on hard times. And strangely, many who deny truth or declare it to be “relative” are the very ones who tend to vehemently oppose those who disagree with their views.
Justice is turned back, and righteousness stands far away; for truth has stumbled in the public squares, and uprightness cannot enter. ~ Isaiah 59:14 (ESV)
Earlier he writes:
Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter. Woe to those who are wise in their own eyes, and shrewd in their own sight! ~ Isaiah 5:20-21
C. S. Lewis notes,
“If no set of moral ideas were true or better than any other, there would be no sense in preferring civilised [sic] morality to savage morality, or Christian morality to Nazi morality. In fact, of course, we all do believe that some moralities are better than others.” Lewis goes on to explain, “The moment you say that one set of moral ideas can be better than another, you are, in fact, measuring them both by a standard, saying that one of them conforms to that standard more nearly than the other. But the standard that measures two things is something different from either. You are, in fact, comparing them both with some Real Morality, admitting that there is such a thing as a real Right, independent of what people think, and that some people’s ideas get nearer to that real Right than others.” 
Apart from truth we cannot truly have justice, order, structure, or a foundation. Apart from truth we are left with opinions, illusions, chaos, lawlessness (anarchy), oppression, and insanity. “Everyone did what was right in his own eyes” (Judges 17:6; 21:25). This can put persons in very dangerous and costly predicaments.
This is, in part, why our societies are in such a mess. We have ideologies based on desire but not logic; we have opinions based on feelings—fueled by emotions—but not necessarily on reason. As if these are not bad enough, the graver consequence is the loss of ourselves—our real self, our true identity, and our deeper meaning.
For what does it profit a man if he gains the whole world and loses or forfeits himself? ~ Luke 9:25
Elsewhere, He says:
For where your treasure is, there your heart will be also. The eye is the lamp of the body. So, if your eye is healthy, your whole body will be full of light, but if your eye is bad, your whole body will be full of darkness. If then the light in you is darkness, how great is the darkness! ~ Matthew 6:21-23
If one’s eye is healthy (desirous for what is true and good), a person will be filled with light (truth). But if a person’s eye is unhealthy (desirous of what is temporal, corrupt, false), then a person will be filled with darkness (falsehood, deception)—and how terrible that darkness is!
Ours is a world filled with passions, greed, and lusts. Because of the insatiable covetousness and cravings, people do horrible things to try to satisfy these longings. As a result, our world is also filled with unpleasant consequences: abuse, wounds, scars, guilt, shame, confusion, brokenness, and fear. Yet, these are not what we were created to be; these are not our identities—at least, not the original intentions of who we were to be.
But what is truth? Pilate had asked Jesus this question:
Jesus answered, “My kingdom is not of this world. If my kingdom were of this world, my servants would have been fighting, that I might not be delivered over to the Jews. But my kingdom is not from the world.” Then Pilate said to him, “So you are a king?” Jesus answered, “You say that I am a king. For this purpose I was born and for this purpose I have come into the world—to bear witness to the truth. Everyone who is of the truth listens to my voice.” Pilate said to him, “What is truth?” After he had said this, he went back outside to the Jews and told them, “I find no guilt in him. ~ John 18:36-38
The text implies Pilate did not really care what truth is—just as many do not care today. What matters is their ability to fuel their drives and succumb to their pleasures. What relevance, then, does truth have?
For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. ~ Romans 1:18-19
So, what is truth? Jesus states plainly:
“I am the way, and the truth, and the life. No one comes to the Father except through me. ~ John 14:6
Sanctify them in the truth; your [the Father] word is truth. ~ John 17:17
“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished.” ~ Matthew 5:17-18
Heaven and earth will pass away, but my words will not pass away. ~ Matthew 24:35
These are astonishing statements. Jesus is not simply saying He speaks truth, but that He is the very essence of truth. He is stating that the Father’s Word (the Scriptures) are truth. He is declaring emphatically that the Scriptures and what He says are absolutely reliable. For those who profess to be Christians (i.e., followers of Christ) but accuse the Scriptures as containing error do not realize the inconsistency of their supposed faith. The very God and Savior they claim to believe in had complete confidence in the Scriptures; in fact, the very Scriptures they cast doubt on are the very ones He declares, “it is they that bear witness about me” (see John 5:39).
At the close of His sermon on the mount, Jesus says,
“Everyone then who hears these words of mine and does them will be like a wise man who built his house on the rock. And the rain fell, and the floods came, and the winds blew and beat on that house, but it did not fall, because it had been founded on the rock. And everyone who hears these words of mine and does not do them will be like a foolish man who built his house on the sand. And the rain fell, and the floods came, and the winds blew and beat against that house, and it fell, and great was the fall of it.” ~ Matthew 7:24-27
Do you realize what He is saying? He is declaring with authority His teachings are foundational, giving stability and structure. It is important to note that many recognize Jesus teaches a lot about love; however, often persons use this as a license and condoning of immorality and unrighteousness. The love Jesus teaches us does have perimeters.
Love is patient and kind; love does not envy or boast; it is not arrogant or rude. It does not insist on its own way; it is not irritable or resentful; it does not rejoice at wrongdoing, but rejoices with the truth. ~ 1 Corinthians 13:4-6 (emphasis added)
Similarly, throughout Scripture truth and wisdom go hand in hand. James, contrasting worldly wisdom from wisdom from above, writes:
Who is wise and understanding among you? By his good conduct let him show his works in the meekness of wisdom. But if you have bitter jealousy and selfish ambition in your hearts, do not boast and be false to the truth. This is not the wisdom that comes down from above, but is earthly, unspiritual, demonic. For where jealousy and selfish ambition exist, there will be disorder and every vile practice. But the wisdom from above is first pure, then peaceable, gentle, open to reason, full of mercy and good fruits, impartial and sincere. ~ James 3:13-17 (emphases added)
So, does truth matter? More than we can even begin to imagine. As long as people continue to suppress the truth (see Romans 1:18-32) in order to pander to desires, mythologizing it and declaring it as “relative,” and speaking such foolishness that persons can have their “own truth,” our societies will continue spiraling downward into mayhem. Even worse, continuing to stumble in complete darkness while never realizing they are in the dark.
 C. S. Lewis, Mere Christianity, (New York: Macmillan Publishing, 1952),11.