I'm not at all surprised that vocational training and work narrows the mind. Many jobs require focusing on required skills. Initially, the goal at university is

I'm not at all surprised that vocational training and work narrows the mind. Many jobs require focusing on required skills. Initially, the goal at university is exploring many options. Maybe that's doesn't involve broadening the mind. But it certainly puts off the narrowing. Once you declare a major, however, and especially in grad school, you're definitely on the narrowing path. Because you're merely human, and need to focus.