Provide things honest in the sight of all men. If it be possible, as much as lieth in you, live peaceably with all men. If we, as the body of Christ, are to mature and grow up we must conform to the truth which is Jesus. The devil is behind every lie and as Christians we are admonished not to lie to one another. The two main reasons we lie are usually rooted in either fear or pride.
Fear is the first reason.
We are afraid of the consequences if we tell the truth. Yielding to fear shows a lack of trust in God to take care of the situation. If we yield to God and do it His way He will usually give us favor with those that we fear. The other reason is pride. Jesus always kept His Word.