Me too! I very regularly hear blindness preached as purely a moral issue. That is, that it is something that we deserve condemnation for because we have consciously chosen it. I now find that problematic. But as to ‘knowing it all’, I would even go on to say that I needed to know it all because I had to get it – whatever it was – right. Failure was not an option; it was destructive and it was shame. Thus, for fear of getting it wrong and bringing destruction upon others and shame upon myself, I would just avoid acting…maybe even avoid the whole situation or person/people altogether. It took me up until probably 4 years ago to recognize that I was trying to do the impossible – earn the grace that was given to me. Talk about pride! 
But how difficult it is to act wisely or correctly when you don’t have all the information!
@chris, I like the metaphor you’ve used, and it reminded me also of St. Paul:
Now I know in part; then I shall know fully, even as I am fully known. (1 Cor. 13:12)
I think it has been mentioned on here before that we cannot know the fuller picture on our own. To know God more fully, I need my neighbors. And, one day, we shall all know fully; but that time is not yet. So, now Chris, I can think about how it’s like viewing a diamond through one of its many facets. And yet we know it’s a diamond because it has revealed itself (in part) to us in a way we can comprehend!