In looking for people to hire, you look for three qualities: integrity, intelligence, and energy. If they don't have the first, the other two will kill you. Warren Buffet
There is a simple but good model for hiring and staffing. Look for character, chemistry, creed, competency and capacity. For work in the Christian context, there are two more aspects as well.
1. Character: Who you are on the inside - like integrity, wisdom, love, goodness, empathy... I add emotional intelligence and relational intelligence in this category. Without a solid character, everything else is going to cause you problems. That is what Buffet is getting at with his emphasis on integrity.