There are different kinds of quotes. The correct translation is that While I talk, Duncan still lives. The more I talk the harder it will be to do this.
The quote said "While I threat, he lives. Words to the heat of deeds too cold breath gives."
This can be found in Page 53 and Lines 73-74. This words were uttered by Macbeth.
The Translation is that the longer I talk about this thing without acting or working on it (that is killing Duncan), the more I start to loose interest or chicken out.
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