Don't try to fix people.

They cannot be fixed only because of your words unless you are a highly influential person or are important to them. The only way to deal with the people that need a little - or a lot - of fixing is to wait. Wait until they fix themselves through their own experiences. Have tolerance.

There are people who are troubled by those who are of lower intelligence, wisdom, and so on. But those people clearly have not reached the second chapter of the book of wisdom. 

Do not mind the people. 

If you really wish to fix someone because you care so much about them, attempt to create an experience they will encounter in order to learn. Do not be cruel, but set up a conte or something similar to help them learn their lesson. For horrible liars, set up a situation where they would lie. Since you know the truth of the situation because of you set it up, you can later tell them that you knew the truth the entire time. Most people would feel embarrassed, and may not ever lie again. Also keep in mind that this is only an example. 

Those who care are loud. Those who don't are quiet. Those who have tolerance are wise.