I was re-reading Thomas A Kempis this morning and it was coming alive for me.
One sentence that struck me was---
"No man is led willingly further than he himself sees."
I think that is so true whether for the Christian or the unbeliever. We love to be taught truths, doctrines, that we have some concept of already, even if ever so vague; but when we are presented with an idea that is outside of our experience or sight, we often dig our heels in and cling to the familiar, even if it is a hollow concept.