Hawking said that at a quantum level it's only possible to know though speed or mass of a particle . I think plank's constant covers this .
However hawking also has said that in terms of people we are biological and chemical and therefore subject to maxwell's laws .
Both hawking and Einstein agree that human behaviour is subject to causality and free will is an illusion .


Garbage that last quote . No offence though buddy
About quotes on determinism, I find more interesting a comment Stephen Hawking made once in Twitter, something more or less like: "if you roll a toy car down a hill, you can be sure it will reach the bottom, but can you predict exactly the path it will follow?"