Don’t under estimate impure motives. Even as you step out to do good for someone make sure your motives are right. Read: Proverbs 16:2 (click on link below and read today’s Scripture)
http://bibleresources.bible.com/passagesearchresults2.php?tp=31&book_id=24&c=16&passage1=Proverbs+16%3A2&version1=51