The truth of feeling good?

This question is very difficult, so I will give my opinion of this. Personally I think it depends on the person, situation and/or the person how we are speaking, in some cases a small lie is very necessary, sometimes we need to lie to make a better day to a person, I'm not justifying the big lies, but we can feel better with the happiness of the other person, for example when your brother shows to you a paint, and for more bad it is we says that paint it's very beautiful to motivate him to do better draws. But in other cases we really need to say the truth, to make a person known about his faults.

The truth is not ever bad, sometimes it is very necessary and better to the person how are we talking, like in architecture, more specific in workshop, the teachers should say to us the truth so we can fix those bad things and we can progress in the career, in the way to be a professional.