Heart.
The inner person - oneself - the seat of thought and emotion.
Has your heart ever ached. Have you ever noticed that some actions, thoughts, truths just don't feel right in your heart while others do. What about love. It makes your heart leap with joy and happiness and you feel...loved.
In the OT Hebrew context, the heart was the storehouse to many of a persons experiences. When Moses recounted the Lords desire that all of Israel love Him, that command probably filtered through their hearts and on to their minds then wove through their souls with all of their strength.
Moses, of course, touched on every known area of a humans life and consciousness to describe how we're to connect with our Creator. But the heart. The heart has web-like strings attached to every area of the body, it seems it's all interconnected. On the one hand it makes us more aware and alert. On the other it becomes untrustworthy as it's left so unguarded much of the time.
Have you checked your heart lately?
Deuteronomy 6:4-5