The obvious part of this quote from Sir Claus Moser is that the taxpayers must support public education and parents or individuals are usually required to pay the bill on higher education. But, once youths finish their education or technical training in an economically stable society in which they can procure lucrative employment, they are able to contribute economically and socially to this society of which they become a productive part.
Those who remain ignorant more often than not become a burden to society, instead. Statistics show that they are prone to be part of a society's welfare system, or even the criminal system, both of which cost a country huge sums of taxpapers' money. Even when college graduates must accept some governement assistance as is the case when unemployment is very high, such as is the case in the U.S. in 2014, they are usually not on this assistance for as long as someone who is a high-school dropout.
Recently, the Lumina Foundation published statistics that show that education provides more opportunities for employment in the U.S. Here is one part of a narrative report:
In 2010, at the peak of U.S. unemployment rates, around 88 percent of 23- and 24-year-old college graduates were employed. No one is saying that the job market for college graduates is easy, but the situation for those with less education is far worse. For high school graduates in the same age group, the rate of employment was only 65 percent; for high school dropouts it was a crushing 42 percent.