It's impossible to ensure that lying is good or bad because this thing depends on our behaviour.
Firstly, I'm giving some examples for good lying. Young lovers always tell each other lovely lies that it's not only harmless but also romantic. Sometimes, lies help us to escape from an embarrassing situation, of course, on condition it isn't so brazen-faced or brings about serious consequences. One day, after I had played game, I came sneakily into my house. Suddenly, my mother saw me angrily and asked: "Where have you been to". I thought that if my mother had known the truth, she would have been sad and striken me sore.I decided to lie my mother and remind myself to make progress with my conduct next time . For another example, when I was 17, I lied my family to work partime in a restaurant, if not, they pretend me from my favourite work.
In contrast, many lying are bad. If lies originate in evil purpose, it will be harmful. Lying can cause consequences which can't be estimated. It isn't excessive to say that wicked lies are the beginning of crimes. Beides, if your lies are discovered, everybody will negatively appreciate your personality and you will feel embarrassing so much if you have self-respect. Children shoudn't lie because they are too young to control their personalitical developing, so lying affects their thinking badly.
There's no man but lies, however, different from rascals, honest men always know how to tell useful and lovely lies.