Chapter 12, Part 3 - Confucius

Sze-ma Niu asked about perfect virtue.

The Master said, "The man of perfect virtue is cautious and slow in his speech."

"Cautious and slow in his speech!" said Niu; "is this what is meant by perfect virtue?"

The Master said, "When a man feels the difficulty of doing, can he be other than cautious and slow in speaking?"
~ James Legge translation via The Internet Classics Archive ~

Go here to read the introductory post to this serialized version of the Analects of Confucius.