'Son' in the Bible

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

There was a certain man without a dependent, having neither a son nor a brother, yet there was no end to all his labor. Indeed, his eyes were not satisfied with riches and he never asked, “And for whom am I laboring and depriving myself of pleasure?” This too is vanity and it is a grievous task.

When those riches were lost through a bad investment and he had fathered a son, then there was nothing to support him.

But beyond this, my son, be warned: the writing of many books is endless, and excessive devotion to books is wearying to the body.