This one took me a long time to learn.
People applying for an open position at your company are much more than what their resumes say. They are more than their education and experience. They are more than their ability to answer questions under pressure or make a first good impression.
They are people. Unpredictable human beings full of surprises.
Sometimes one has to look past the surface and evaluate candidates based on the impact they can make on your team. Instead of only focusing on them as individuals, think about the whole picture. What could improve if this person starts working with us? How is this person going to change things around here?
A lot of good things can happen when people are giving the opportunity to work under the right conditions around equally motivated individuals. These things are hard to quantify and they usually don't come up in 60-minute interviews, let alone in 500-word resumes.