@Ghost800 Again its true you don't have to remember the truth but you have to remember all the lies you tell to avoid contradicting yourself.
But If a person always tells the truth he/she would probably shift to a cave or make a fortress of solitude .
For example - If someone doesn't like a person and he balantly tells him so, will this make the other guy feel good?
... How about the same answer to himself from any other guy or his/her crush ? ....
You likely wont hesitate to tell the truth to a stranger cause his/her opinion really doesnt mater to you in the long run
but How about if your mom/dad made your favorite food but unlike other days its not as good as you hoped it would be , would you say it in her face that it was bad and that her hard work was useless ?
Depending on the situation and your relationship with that person ,you might have to change your answer :)