Here's a few more political ones, applicable to any time in history:
"The cat in gloves catches no mice."
"Sell not virtue to purchase wealth, nor liberty to purchase power."
Gramps was also a bit of an atheist, it would seem:
"The way to see by faith is to shut the eye of reason."
"When knaves fall out, honest men get their goods. When Priests dispute, we come at the Truth."
Hmmm... maybe not atheist, but just distrustful of organized religion?
"Fear not death; for the sooner we die, the longer shall we be immortal."
That doesn't sound very atheist to me.