Well, angels and men have in common that they are both beings, but are very different in the type of beings they are. Angels are pure spirits. Men are spiritual and corporeal. Angels are immortal. Men are mortal.
Angels understand without reasoning.
Men reason in order to understand. There are many differences. Like, not and more than - these characterise understanding through the steps of analogy. The natures of bodies are what we primarily understand but analogy enables us to move beyond the scope of our immediate object. Although it is true to say that our knowledge of things above bodies is negative, that is we know what it is not rather than what it is, and that what we do know is a lot less than what we do not, still the little knowledge we have by analogical comparison is true knowledge.