The heart is deceitful above all things, and desperately sick; who can understand it? “I the LORD search the heart and test the mind..."
When placed into a situation where you have to deal with a deceitful person, who you cannot trust, what do you do? Would you follow them? No. The counsel to “follow your heart” is from the pit of Hell. A moment of anger or desire can trick you out of a life’s work or a life long relationship.
Instead, you keep them at arm’s length. You watch them, understand their selfish motives, and you protect yourself from their actions. We have a partner in this, this verse tells us the Lord tests our heart and knows all its tricks. His advice:
You follow me!”