I was reading and thinking this morning about the importance of words. Words can be deadly. I would venture a guess that without too much thinking you can recall a time when someone said something hurtful to you. Perhaps it was a name someone called you, or an accusation made to your face, or something whispered behind your back. Whatever it was, it hurt. The fact that you were able to so quickly recall it signifies its lasting impact on you. Its impact may have been amplified by who said it. If your teacher said the hurtful thing to you - it may have affected your willingness to learn or your self-talk about how smart you are.
The Bible talks a lot about words. I love the message of Luke 6:45b where it says our mouths speak what is in our hearts. If our hearts are filled with good and lovely things - our mouths will speak good and lovely things. But, if our hearts are filled with evil, our mouths will speak evil. James 3:6 speaks about how the tongue can set aflame the entire course of our lives.
What comes out of our mouths reflects not only what we think about others - but what we think of ourselves. Our self-talk reveals what is stored in our hearts too. Do our hearts hold what God thinks of us, or what others think of us? Whichever it is, it is telling about what we treasure. If we cling to the ugly words others have said about us, we are much more likely to speak those words to or about others. If we cherish what God has said in His Word, our speech will be glorifying to Him and inviting to our students.