Murray Rothbard

The fact that natural-law theorists derive from the very nature of man a fixed structure of law independent of time and place, or of habit or authority or group norms, makes that law a mighty force for radical change.

If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.