Leaven = all-or-nothing thinking (atheist, quote, Jesus, atheists)

[granpa]

"Beware," Jesus warned them. "Watch out for the Leaven (all-or-nothing thinking) of the Pharisees (Theists) and that of Herod (Atheists)".

A little leaven leavens the whole lump.

All-or-nothing thinking is like a computer virus. Once you are infected it affects your whole mind.

one way they infect you is by making you angry

[Tzaphkiel]

Originally Posted by granpa

one way they infect you is by making you angry

anger causes a person to lose their wisdom
literally

an angry person has no wisdom

good point granpa

[granpa]

the point is that leaven is so tiny you can barely even tell its there yet it is powerful and dangerous

[Skyl3r]

Yes, I agree! Be careful!
You don't want to risk accidentally thinking rationally. Don't let anyone try to trick you into doing so.

Once you start thinking rationally, it makes it hard to ever understand how you thought so bizarrely before.

[hljc]

leaven was the rising yeast that was in bread , which was puffed up the bread , so Jesus says to not be puffed up in pride , as a proud person would have there nose in the air as they were puffed up and indifferent

[granpa]

Yes being puffed up would be an example of all-or-nothing thinking