How easy it is to make assumptions about persons and things. For example, in the hiring of teachers it is often presumed that (a) demonstration of certain competencies (a degree, teacher training/certification, teaching experience, et al) translates into (b) a good or suitable teacher. Of course, we have all experienced "qualified" teachers who were dull, uninspiring or otherwise "useless" (with respect to communicating something to their students that was helpful to the students' lives).
How to avoid "misplaced" teachers in the hiring process? For one thing, beyond screening through a simple cover letter and resume, perhaps we could additionally have the prospective teacher write about his or her philosophies of education and of life. If we are faced with a generic ("boilerplate") philosophy of education, there's a red flag; a teacher who thinks that life's meaning is found in mere financial success or other extrinsic rewards is one who should not teach at our school.
In addition we might ask a teacher to read a relatively short article, essay or story and ask, "If this were part of your curriculum, how would you use it? What is important or useful in it to you personally? What elements in it do you think your students will find difficult? How would you help them overcome the difficulties?"
"What kind of man or woman are you?" is far more important than the degree in hand. People with a passion for the destiny of their students -- that's the ticket.