What are the branches of speculative philosophy?

"Philosophy" literally means "love of wisdom", and the topics that fell under this name covered what we now pick out as philosophy, logic, science, medicine, ethics, social science, psychology, and religion.

Philosophy might be thought of as made up of two components: critical thinking and passionate vision. But "critical thinking" does not necessarily imply the hermeneutics of suspicion, skepticism, or intellectual paranoia--all too often the trademarks of the bright young professional philosopher. One can be "critical," that is, reflective, while at the same time be committed, even devoted, to an idea or a way of thinking.