We as humans always think about something. Initially, when Adam and Eve were created, their thoughts were mostly about what to eat, or where to sleep. But a lot has changed since then. When man ate from the Tree of the Knowledge of Good and Evil, their thoughts changed. Their way of thinking became full with evil intentions, with an evil heart. However, Jesus came with the opposite state, with a pure heart, completely different from Adam. Now we have a choice to obtain that same pure heart!