Revelation 3: 16 (NKJV)
So then, because you are lukewarm, and neither cold nor hot, I will vomit you out of My mouth.

Our efforts at being moral, being nice or being useful in the world do not put us right with God since we have all ignored God's ways and justified our actions in one way or another. God requires that we turn around from a self-directed life (this is called repentance) by admitting we've offended God in the first place and asking Him to forgive us. If we're serious about turning around from a self-directed life we'll show it by working at living a Jesus-directed life. So what does this scripture mean?

Truth is, there are plenty of people who say they are believers but their actions give them away or worse, whatever efforts they do make to serve God are inconsistent, half-hearted and filled with complaint and self-seeking. Churches are full of people eager for recognition but quick to complain, criticize, and quit whenever "serving" actually equals effort or sacrifice instead of fun and games. Jesus makes it clear that He wishes we would either get going or get lost, hot or cold - but half-hearted just makes Him sick. It's true that our works do not save us, but our works do show how serious we are if we say "I will follow Jesus." Let's pray, learn and help each other give our very best in God's service. After all, God gave His very best so we could be made right with Him.