Complain much?

I have thought about this topic for a while now and struggled with what I wanted to say.... So, I am gonna cheat and provide a couple of links that I found helpful!  :)
How can I overcome a critical spirit?
What does the Bible say about complaining?

The links will take you to a couple of short articles written on the subject of complaining and being critical. If you don't want to read them (although I highly recommend it) here is a summarized version:

"Clearly, as believers we are challenged not to grumble or complain (Philippians 2:14-15;1 Peter 4:9); rather, we are to love one another deeply so that we may become “blameless and pure” in God’s eyes. If we grumble and complain, it shows how worldly we still are (James 4:1-3). A complaining spirit leads to fighting and quarrelling because complaints come from unfulfilled desires, which lead to envy and strife."
"The condition of our heart is crucial.Luke 6:45 says, "The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks." Critical words spring from a critical heart.  Another important area is our thought lives (Romans 12:1-2;2 Corinthians 10:5). Rather than focus on what is missing, we should think about what is true, honorable, just, pure, lovely, commendable, excellent and praiseworthy (Philippians 4:8)."