[__ingrid__]

I think you are misinterpreting that advice. I have always heard the full saying as "hire slow, fire fast" and if you are seeking to build a good culture, you probably want to keep turnover reasonable low. Seeing many people come and go will wear on the people you chose to keep, and it will be counter productive to building a good culture. Obviously good is a bit subjective when it comes to "culture" but I assume you are aiming at least for an environment where people are somewhat happy and strive to be productive.