Fools start out talking foolishness and end up speaking awful nonsense.
The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.
The beginning of the words of his mouth is foolishness, and the end of his talk is wicked madness.
The beginning of the words of his mouth is foolishness; and the end of his talk is mischievous madness.
At the beginning of his words is foolishness, and at the end of his talk is a most grievous error.