Why Should The Work Cease? - Nehemiah 6:2-4

Nehemiah 6:2-4 KJV2 That Sanballat and Geshem sent unto me, saying, Come, let us meet together in some one of the villages in the plain of Ono. But they thought to do me mischief.3 And I sent messengers unto them, saying, I am doing a great work, so that I cannot come down: why should the work cease, whilst I leave it, and come down to you?4 Yet they sent unto me four times after this sort; and I answered them after the same manner.