'Son' in the Bible

The words of the Preacher, the son of David, king in Jerusalem.

For when those riches are lost in bad investments and he becomes the father of a son, then there is nothing in his hand [for the support of the child].

But beyond this my son, [about going further than the words given by one Shepherd], be warned: the writing of many books is endless [so do not believe everything you read], and excessive study and devotion to books is wearying to the body.