a matter of trust

I have a periods of exams these weeks..which make me think less, live less, eat more :)) but it's not about that now..A funny thing happened at a exam..
I stood beside one of my colleagues whom I know quite well..and I know she believes I read more than her..maybe that would be true, but offers no guarantees for the power of the memory..and at a moment, she asked me something which involved figures..I answered somehow confidently and she changed her answer for mine..I confess I was not reassured with that at all..knowing my memory for figures..but I was not able to convince her I might be wrong..Of course I was wrong..and she was right..or would have been right if had not modified the answer.
So, when I came across this I could not help smiling:

"People follow those who believe thoroughly in what they say!"