Wonder

I collect quotes. I usually note my sources, but somehow I failed to get this one. Googling didn't help. It's someone quoting Josef Piper quoting Aquinas. If you know where it came from, please inform me.

facing the truth that we know in part allows a healthy sense of wonder to return, for it is only the one who does not fully know who “wonders,” as philosopher Josef Piper points out: "To wonder is not to know fully, not to conceive absolutely; it means not to know what is behind it all; it means, as Aquinas says, 'that the cause of that at which we wonder is hidden from us.' And so, to wonder is not to know, not to know fully, not to be able to conceive. To conceive a thing, to possess comprehensive and exhaustive knowledge of a thing, is to cease to wonder."