Debate: Is Lying Justifiable?

So, is lying justifiable? Most of you will say 'Yes. it is.' since all of us have lied before and will not want to be caught in a spot if we say no. I feel that the answer should be sometimes as there are these so called 'white lies' which people claim that are told for benign reasons. Benign is an adjective that means kindly, by the way. But are telling 'white lies' good for the recipient? Say the your aunt is slightly plump and when she asks you whether she is fat, do you say that she is fat or that she is just perfect to make her feel happy? However, if you keep on telling her that she is perfect and then suddenly one day someone not so considerate tells her that she is fat and then your aunt would be crushed as all the time she was thinking she was perfect because of you and suddenly someone tells her that she is fat! If this really happens, should you have told your aunt that she is perfect? You think about it. Of course, if your aunt is severely overweight, you should just tell her the truth, that she is really fat, as it will be good for her health.

In this case, one can argue that you did not tell the 'white lie' with the intention to harm your aunt. By this definition, telling a lie is justifiable until you hurt someone by telling the lie. But then how will you know whether your lie will hurt someone or not? Think about this the next time you are going to tell a lie('cos you will, believe me).