It depends on whose standards you are trying to live by. We all reap what we sow. How do you feel about someone lying to you? The golden rule says "do to others as you would have done to you". That is a good life code to live by. The results are phenomenal (smile)
Robert Heinlein once said that if you think you should never lie, try telling a friend the unvarnished truth about his teenage son.
Rule of thumb? Learn the difference between lies and tact.