Mencius - Book 4, Part 1, Chapter 26

Mencius said, 'There are three things which are unfilial, and to have no posterity is the greatest of them.

'Shun married without informing his parents because of this, lest he should have no posterity. Superior men consider that his doing so was the same as if he had informed them.'
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.