No-one can philosophise and indulge in ways of life incompatible with it.
Philosophy is a life-long occupation, and there are few philosophers.
Even professors of philosophy are rarely philosophers, since teaching philosophy and philosophising are not the same thing. Teaching philosophy secures the freedom to philosophise with the least damage to the philosophical life. For example, Bergson was a wonderful teacher, but what he taught had nothing to do with his own philosophy. The answer is that students come to understand through their own intellects, and they are their own teachers. When Descartes was asked this question, he surprisingly recommended, not his own works, but the complete courses taught by the Jesuits.