I love Proverbs 4:23 in the Good News Translation - Be careful how you think; your life is shaped by your thoughts. Cognitive science is catching up to this Biblical truth that your thoughts shape your life.
We can't control everything that happens to us, but we can control our reaction to those things. You can't control every thought that pops into your head, but you can control which ones get to move in permanently. When I was a teenager, I let some pretty unhelpful thoughts take up residence in my brain and they changed my life. I wish I had really understood what Proverbs 4:23 meant. I encourage you to use a journal to write down your thoughts and reflect on whether they are really true or not. What does the Word of God say about each thought?
Short and sweet inspirations for Christian teen girls.