Philosophies, like universe or infinite, depends on the context. There is no simple single theory yet (that would be god concept? and then we question where did he come from etc)
i would approach philosophy no different than physics. There are "spiritual laws" (philosophical?) that govern human mental state, and help understand it better. Buddhism tries to conceptualize this as much as possible.
personally i believe we should only depend on the "truths" or "laws of nature" either physical or meta, that we humans were able to figure out so far...like physics laws, spirutual laws "karma" etc.