An example to follow.

Paul tells us that we are called to earn our living and earn the food on our table. As Christians we are to work for our keep and know that everything we have is from effort on our part and not from leeching off of someone else.
When Paul was writing to the Thessalonians, that if we can, we should do our part to support ourselves and our families.
It might be easy to say this but how easy is it to actually do it.
If you have a family member that is 'down and out' and comes to you for help....will you help them?  or tell them to go somewhere else?
Difficult one!

Paul, is not talking about those people who could not work, but who would not work!
All Christians are called to not be supported by others but go out and find work and support themselves.
 It says in verse 12:
We command such people and urge them in the name of the Lord Jesus Christ to settle down and work to earn their own living.

Though one may be tired in doing what is right, he should never tire of doing what is right.

If Christians fail to obey what is taught in this letter by Paul, he warns them that they will be the only ones ashamed.
It is very difficult to turn family members and friends away when they are in need, it is always easy to quickly help them...problem here is that they get used to support from others and will get into a habit of not helping themselves and getting help from other.
Never get tired of doing good things but be careful of how you go about doing them and "helping out" others.

Blessings

Reading: http://www.biblegateway.com/passage/?search=2%20thes%203:6-15&version=NLT