Totally incompatible

“You offer defiled food on My altar, But you say, ‘In what way have we defiled You?’ By saying, ‘The table of the Lord is contemptible.’ And when you offer the blind as a sacrifice, is it not evil? And when you offer the lame and sick, is it not evil? Offer it then to your governor! Would he be pleased with you?  Would he accept you favorably?”, says the Lord of hosts.   Malachi 1:7-8

What does it mean to do your best?  To give your best?  “Give of your best to the Master…”  Isn’t going about my Christian life in a half-hearted way a lame sacrifice?  If I give him my best, or try to, I don’t win points with God.  Rather, I become a more authentic follower of Christ.  After all, insincerity and luke-warmness are totally incompatible with Christianity.  Totally.