Truth is rooted in the eternal God who's all powerful and unchangeable. Jesus prayed, "sanctify them by the truth: Your word is Truth" (John 17:17)
Truth is far more than facts. It's not just someting we act upon. It acts upon us. We can't change truth, but the truth can change us. It sanctifies (sets us apart) from the falsehoods woven into our sin natures.
As followers of Christ, we are to walk in the truth (3John 1:3), love the truth, and believe the truth (2 Thessalonians 2:10-12). We're to speak the truth "in love" (Ephesians 4:32).
Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the father, but by me.