Who can explain what 'sanctify procreation' means?

Thank you so much!

"Primitive marriage, or whatever other deep-rooted folk-custom has ever been practiced to sanctify procreation, was anything but sentimental."
Oswald Spengler

Question

Who can explain what 'sanctify procreation' means?

Thank you so much!

"Primitive marriage, or whatever other deep-rooted folk-custom has ever been practiced to sanctify procreation, was anything but sentimental."
Oswald Spengler

Answer

If you "sanctify" something you are making it legitimate, usually within a religious context. So, in that case it seems to be talking about in what cases it would be socially acceptable to have children.