  At the other extreme are forms of moral particularism, according to which one directly intuits the moral rightness or wrongness of an act once one has understood its particular natural features (see the entry on  moral particularism).  As in the previous case it is necessary to comprehend the non-moral features of the situation before a specific moral judgment can be made and known to be true. In making this judgment, however, one must rely not merely on knowledge of these non-moral features but on one’s ability to intuit the moral significance of these features. The difference between the cases is only that in the first we appeal to a general principle, while in the second we intuit the moral truth directly. In both, moral intuition is essential to arriving at moral knowledge. W. D. Ross provides an example of a mixed form of moral intuitionism (Ross 1930). On his theory we have an intuitive grasp of principles that tell us what we ought to do “other things being equal” (e.g., one ought to be kind, other things being equal). Then we must use moral intuition again to decide in a given case, which may involve conflicting principles, what action we ought to perform, all things considered.