(Pro 12:19 KJV) The lip of truth shall be established for ever: but a lying tongue is but for a moment.
I like way the KJV puts this. While the NASB says “truthful” (571) “lips” (8193) the KJV phrases it “the lip of truth.” This speaks of the reputation that we have. People can either take what we say to the bank or thy can doubt everything we utter.
How they feel about us will effect how they feel about our God. If people who call themselves “Christians” are liars, what does that say about the One who called Himself the Way, the Truth and the Life (John 14:6)? How can they trust Him for eternity if they cannot trust us about what time we got to work
So? As someone once pointed out, you may be the only Bible some people ever read. Make sure you are an accurate translation.