It means a lot to God for us to tell the truth, it is even a matter of life and death. Eternal life is a promise from God to the believer who loves the truth and not lies. Revelation teaches us there will be no liars in heaven(Revelation 22:12-15). 12 And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.13 I am Alpha and Omega, the beginning and the end, the first and the last.14 Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.15 For without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.
There is the truth of men, but it is the truth of God that makes the difference in the life of those who believe and are forever changed by the holy spirit of truth we receive when our sin is genuinely repented of!(John 14:15-21). 15 If ye love me, keep my commandments.16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.18 I will not leave you comfortless: I will come to you.19 Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also.20 At that day ye shall know that I am in my Father, and ye in me, and I in you.21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.