Truth depends upon our subjective perception and the most we can say is "it is true for me". What happens when different people have different opinions on what is "true"?

The truth is that people don't trust others who have a different opinion on the truth. This in turn has social effects that impact the quality of your life.

For example, one can truthfully believe something is a lie, but choose to pretend it is the truth. Even the most honest individual will swear under oath to something the believe is a lie. This happens every time someone is forced to agree with the opinion of their government or face consequences.

The government is just one of the more pointed parts of society in general. A commitment to be truthful at all times is a suicide pact that will get any honest man thrown in jail.