2He that walketh uprightly, and worketh righteousness, and speaketh the truth in his heart." (Psalm 15: 1-2)
To abide in the LORDS' tabernacle, we have to speak the truth in our hearts.
What does that mean?
Today, the truth is about Jesus:
"Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me." (John 14: 6)
"And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth" (John 1: 14)
"For the law was given by Moses, but grace and truth came by Jesus Christ." (John 1:17)
John would then invite one of his friends in the faith to:
"Beloved, I wish above all things that thou mayest prosper and be in health, even as thy soul prospereth. " (3 John 2)
How do our souls prosper?
"For I rejoiced greatly, when the brethren came and testified of the truth that is in thee, even as thou walkest in the truth. 4I have no greater joy than to hear that my children walk in truth." (3 JOhn 3-4)
Truth is all about walking in the grace of God, that our sins have been put away.
"1Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; 32And ye shall know the truth, and the truth shall make you free." (John 8: 31-32)
"To whom we gave place by subjection, no, not for an hour; that the truth of the gospel might continue with you." (Galatians 2: 5)
"Be not carried about with divers and strange doctrines. For it is a good thing that the heart be established with grace; not with meats, which have not profited them that have been occupied therein." (Hebrews 13: 8)
The truth that we speak to our hearts today is not the Mosaic Law or the Old Covenant, but rather the New Covenant of God's grace in our lives (Acts 13: 38-39; Hebrews 8: 10-12)