'Truth' in the Bible

The elder [of the church addresses this letter] to the elect (chosen) lady and her children, whom I love in truth—and not only I, but also all who know and understand the truth—

because of the truth which lives in our hearts and will be with us forever:

Grace, mercy, and peace (inner calm, a sense of spiritual well-being) will be with us, from God the Father and from Jesus Christ, the Father’s Son, in truth and love.

I was greatly delighted to find some of your children walking in truth, just as we have been commanded by the Father.