Jesus is truth incarnate. And his word embodies truth in every letter. He is the way, the truth, and the life. He promises that if we continue in his word we will know the truth, and by that truth find true freedom. And here's the mystery and paradox of Jesus' truth: "If we say we are without sin, we deceive ourselves, and the truth is not in us" (1 John 1:8).
To abide in Jesus' word and know the truth is to recognize our need for a Savior, to believe in Jesus of Nazareth as the one and only Son of God. It means that we recognize the reign and rule of God in Jesus, repent and believe the gospel. Then we hear him say, "Father forgive them, for they know not what they do" (Luke 23:34). And believing that we dare not hold to anything that is not truly true. That means holding to Jesus.
On this Valentine's Day, rejoice in the true love of God - shown in Jesus, and pure and good in every way.