At his word?

If what we originally know about Jesus comes from the Bible, and he is recorded as saying, "take up your cross and follow me," and also, "narrow is the way," it's a wonder why we ever think his way will be whatsoever easy or that heaven will heavily populated.

It's a wonder he had followers at all. However he did, so they thought his words were accurate, and his ways were worth it. They, as first century christians were eaten by lions, and they could have changed their minds.

How is it that we put this way on par with other spirituality? Are all faiths the same? They share some common themes, but some claims diverge quite sharply as one dips the toes in to any one of them for very long.

Holding on to "unkowning" is still believing as a certainty. However that "certain" uncertainty seems to be the kind that may cause a great sinking feeling after a while. It seems we all we to be sure of something, even if that means we are sure that we are not sure. But, too much of that is just vertigo. I've tried it. It felt like I had to throw up. Once in a while I did.

So, what things can we be sure of?
What things are you sure of?