A graduating doctor or nurse should have a basic idea of the nature of various religions and their general requirements, preferences and practices. (slaw.ca)
There may be in man an intuition about this desire without having any clear idea of its nature. (faith.org.uk)
The very idea of a nature means that something is integrated into an environment, that through the laws of this environment it is subject, i.e., can not do whatever it likes. (faith.org.uk)