Como dizer "Seja quente ou seja frio, não seja..." em inglês

"Be either hot or cold; don't be lukewarm because I'll vomit you."

Uma professora de inglês deu uma olhada e disse que assim fica "feio". Mas não disse a forma correta, apenas deu um palpite e saiu de perto.

Segue a passagem que procura em inglês.

I know your deeds, that you are neither cold or hot;
I wish that you were cold or hot.

So because you are lukewarm, and neither hot nor cold,
I will spit you out of my mouth.
Revelation 3:15-16 NASB

Be either hot or cold; don't be lukewarm because I'll vomit you.

"So, because you are lukewarm, and neither hot nor cold, I will vomit you out of my mouth."
"Hot or cold please; not lukewarm, or I'll spit you out." (more informal)
"Be hot or cold, not lukewarm, or I'll vomit you." (shorter)

Parallel translations (many different versions):
http://bible.cc/revelation/3-16.htm

Please note that most of the texts in the Bible have been passed from mouth to mouth over a long period of time before being written, and were translated to many languages.

Is it going to be a tattoo or a newspaper article? Damn, that's a long message to tattoo.