Keep Your Heart by Dr Michael H Yeager

What Does it Mean to "Keep Your Heart"?
In the Old Testament the word “heart” is used more than 800 times, but more than 200 times it deals with one's thought life, emotions, the wellsprings of life, those things that motivate and mold us. The Bible calls that the heart. I’m calling it the thought life.

Why is the thought life so important? Why did Solomon tell his son, “above all else, guard your heart; for out of it are the issues of life?” Because the thought life controls the rest of your life.

If you tell me what you think, I’ll tell you who you are and the life you live. What you think is what you are. The thought life controls you. “As a man thinketh in his heart, so is he” (Proverbs 23:7).