You asked whether Jesus quit. I am certainly in no position to cast any stones, nor would I in this case, but I think we can recognize that, yes, at some point it appears he decided to hang it up.

His followers would have fought to protect him and his message, of course. Even without that, he could have easily escaped Jerusalem and gone on to spread his teachings many other places. He declined both of these options.

Everyone is going to give their own reason for why he did that, almost all of them simply parroting what someone else has said about it. They may even just deny that he did it all.

The reason I bring all this up is that, to the very small extent to which I have tried to spread the truth, even truths that seem quite plain to me, I have found that very, very few are interested in the truth. So you can bang your head against a brick wall because there really is a non-zero chance you're going to bash it down, but after a while you get tired of it.

I recall what Jesus Himself said when he was talking about "ask and it shall be given you". People think it's a statement about God's generosity, but there's a subtle subtext that is universally missed: You see, what is stated is that a person has to ask, or seek, or knock. It doesn't happen automatically.

So look around and ask yourself, how many people do you really see asking, or seeking, or knocking?