  It is not clear that all intuitionists understand intuitions on this perceptual or quasi-perceptual model, as many do not use this notion at all. W. D. Ross, for example, uses the notion of apprehension, but he tends to base his moral theory largely on our considered moral convictions. “[T]he moral convictions of thoughtful and well-educated people are the data of ethics, just as sense-perceptions are the data of natural science” (1930/2002, 41). Convictions are, however, a certain type of belief rather than an intellectual apprehension, or seeming. So it looks like we can find two notions of intuition in intuitionist thought—one understood as an intellectual seeming or apprehension, and the other as a  pre-theoretical, non-inferred, firmly held belief or  conviction.[2]  Which one they opt for makes a difference to their epistemology.