But all they gave him was lip service; they lied to him with their tongues. Their hearts were not loyal to him. They did not keep his covenant. (Psalm 78:36, 37 NLT)
What you say you are and what you really are can be two totally different things. God's not looking for us to merely give Him "lip service," when our hearts are far from Him. That's hypocrisy of the worst sort and was severely reprimanded by Jesus when He found it in the religious leaders of the first century. He deserves a passionate, heartfelt love that motivates a passionate, heartfelt life lived for His glory!