M&D Fox's Advice (p. 38)

[jbor at bigpond.com]

On 17/01/2006:

>         Dixon, his thoughts on his mortality, casts aside his Quaker
> sensibilities, to join forces with Mason in the medical work, thinking 
> of
> "Fox's advice" which refers to  Charles James Fox, a famous British
> symbol of religious tolerance

That'd be George Fox (1624-91), founder of the Society of Friends 
(Quakers):

"Walk cheerfully over the world, answering that of God in every one." 
_Journal_ 1656 (ed. J.L. Nickalls, 1952, p. 346)

A nice sentiment, and the apparent inspiration for Pynchon's 
characterisation of Dixon in the novel. I don't think he ever really 
"casts aside his Quaker sensibilities", though sometimes circumstances 
force his hand to act contrary to them.

http://www.gwyneddfriends.org/fox.htm

best