What does this mean?
"They will have to really believe that all students can achieve high standards. This is a matter of faith as much as hard evidence and no one should underestimate the difficulty of achieving this shift, day to day, classroom to classroom across a country."
"They" are teachers and I can understand the first sentence but I am not sure about the latter one.
Especially, I am not sure what "matter of faith as much as hard evidence" mean.
Could you write it in another way?