Objective truth exists and you should seek it. (Study Logic)
To say, "there is no truth, truth is a matter of opinion" implies an objective truth--the objective truth that there is no truth. So through the Law of Non-Contradiction this sort of relativism of "You do you" falls short in our society. Relativism falls short and it shows. Just look around to see how far our country has fallen without truth seeking--without the order of living in objective truths, man turns to chaos. In Christianity this is accomplished through the spirit.
1 Thessalonians 5:23 "May God himself, the God of peace, sanctify you through and through. May your whole spirit, soul and body be kept blameless at the coming of our Lord Jesus Christ."
The Greek word τό πνεῦμα here is the rational (LOGIC) part of man, the power of perceiving and grasping divine and eternal things, and upon which the Spirit of God exerts its influence. So in return it's Biblical to pick up a logic book and study the scriptures. God isn't contradiction. God is objective truth.